Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b3e96ae53d1ed7…

MALICIOUS

PDF

132.9 KB Created: 2021-06-17 19:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc1281faf4cbec56f52fa6c3f7ed5342 SHA-1: 26bcb1f51010f63aed6685b581144e5d6384df69 SHA-256: 40b3e96ae53d1ed7ea68ab9c9afb77fcdd4af3e63a18929bc0f2c42d7ae83501
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thepainter.asia/upload/files/levenikimunef.pdf In PDF document text
    • http://clingac.com/d/files/6525689635.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5c2da0d7b2aa2277a6fcd177569ea893/dazis.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e73acf1d3e7106e8b071f0e61a8cbd30/95884090163.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092360eeba56---pifiwowudateromun.pdfIn PDF document text
    • https://citytrafik.nu/images/file/87869495206.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bce37f0dd---64550060782.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/8457295732.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4b1bcdf8---voparuduvapudojuwenojep.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/p4humubs497ncmn9g1gsi8cn24/49459935020.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/19659115785.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210514/file/61416293492.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073793d6a77f---17987031301.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/85899431936.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/dibirepogumef.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608002e78a18b---12236174105.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/zevokipo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wrestling+revolution+3d+wwe+2k19+mod+apk+downloadPDF link annotation
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001e678.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E678 18520 bytes
SHA-256: 9c2bc6842f81ea4baac8809c5c2ce0576277f9e28ad30e39011733fe7a97812b
font_00_sfnt_off00015d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D50 13216 bytes
SHA-256: 633ef2b29c18f3197930ff4d98efcdfc797fb1e15529207d48a129f49c33d76a
font_01_sfnt_off000188b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188B9 6012 bytes
SHA-256: 54006afc6d56a6c858e0606aecf85bb160ec482a9cc703e1003c390210947e05
font_02_sfnt_off00019d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D2D 2212 bytes
SHA-256: 79777cc3bf14d7c36a1b02e3a6eec7776755bc8dd20168ec0a9c245fb2c46eda
font_03_sfnt_off0001a73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A73D 6820 bytes
SHA-256: 4b74deaa959a5bf4f6a282d51205d7f9858e0231b2ae5d3b19ae416bc25197f4
font_04_sfnt_off0001b975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B975 14016 bytes
SHA-256: 5b80a12f6f78015292dbd6310631d0864ca14c64fa6ad5e1c59b0d831601d100

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