Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2b67c9fb78a6b2…

MALICIOUS

PDF

110.6 KB Created: 2021-05-27 12:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 06d0a14dcafc4baff85f1556173cb418 SHA-1: 66ff2910f5fcf9c48ab49731754ee273636ae017 SHA-256: 0a2b67c9fb78a6b218e00dc937ebd38703408967173acee453e3408cef1d376e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=yes+and+amen+lyrics+pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/oa6c40vvbafikudd4k1mqnea45/72947146785.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fefq1dsir0689ioegd5obl3v95/xibifojazugezobikinutun.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/c557l5ss9uh4c5cf3gt65gg8u1/wimilusisorowape.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/54421bd5df4052d05f96e541270867f8/somifise.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e0cb96b8d1d00134e55b2630d6a94a91/37866706166.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077927d78e65---36544262130.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c07755495---refujuvikopobituno.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9a45e3a6---91877945047.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082749d92173---saloxum.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f1f08371c89fb0cc7c128e81ba4b2d30/88584543673.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3519e5897---11703386967.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f6add58704c1afb088e137d0494288c1/82416726299.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608a831e29e2a---liwujemi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/380fae05bb2cd0da0ff5403e48cfb130/46421087492.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16087842a350fb---zeliv.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088712c05efe---19491470596.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2c3902a34f15a10c693fe446151cf2c3/zutesezigaferozagerewiza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 7260 bytes
SHA-256: 99689982ceb5f16e2eb5a1caf356078198fa78eaa2c6b5765f797fb67c05a0e8
font_01_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 4964 bytes
SHA-256: a6b241005e92114b0f37f76df90f82d5ae733ecf6dd08a03ae7c98113bde6876
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 6196 bytes
SHA-256: 0f560a44eec3c61efe7b1bfd140208b5caaaf80770d854f24987ce180ce58562
font_03_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 2232 bytes
SHA-256: ec30c1c2738fe2838625f4b340c193c2d164ef7851d5b227c5f383e674c62a5a
font_04_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 25468 bytes
SHA-256: 7aa1396b2b9ec8b41766239379abfa279b592b12bd295d9348a2d5814acf48e5
font_05_sfnt_off000171bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BF 17776 bytes
SHA-256: 734325637eb248490e98e8945f8ff9ae8c3d0ce48b24a7df3f593cb14dc88bc2
font_06_sfnt_off00018d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D25 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
font_07_sfnt_off00019ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AE7 6380 bytes
SHA-256: aecbb75e3939fdc180b1c1656ac1259e51f74be0a7747ad6a0bd16efee1f4f60

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