Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e8586a4745bd92…

MALICIOUS

PDF

107.0 KB Created: 2021-06-23 18:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9f11fac2da00b823cc884fa7556afd6d SHA-1: d1bfc9d5b517e270bcff21709a15bafdd5d74ba9 SHA-256: c6e8586a4745bd92c01a73f4ec17f79dad66b87908b36e49ba4102410d32b29d
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 0.9991

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://pixomot.ru/uplcv?utm_term=mitsuha+weathering+with+you PDF link annotation
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c36287a4012d0d1500c88f7c88827016/redutewuwofotafutawaf.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6f8ca8da---73457317712.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160751cc009fa2---bofizevugefibas.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/76981687088.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c50bf0a1---nadevumujola.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p4cos79evphcldh915885eth5e/jagob.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/73169264893.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/ragosunebatozevolazow.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85793af2b0---71057815067.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5576bc92---38550513256.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bbc6a99b66f4786646eb7a9ffeeffdfe/jowirewekiba.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c81d4a18---zefavakav.pdfIn PDF document text
    • http://vejwun.cz/images/kanamuniresejipibaladop.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qoka7se3r1s4h144labkc94vv0/pizewutileravuwebe.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/zekasugebazolofopod.pdfIn PDF document text
    • http://www.opentle.orgIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013aff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13AFF 17152 bytes
SHA-256: 4555b631490df87b698068ff3114b886fbd73dcc09127e73618ba14603703b59
font_00_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 16684 bytes
SHA-256: 17e03c55a4203e126fdf0f294b4f025547078b24aed28914882714bdee669c6c
font_01_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 4996 bytes
SHA-256: 77f728815cd18051239652c74b57d05c5b8201450dec59ea858716e2c25a03cd
font_03_sfnt_off0001697f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697F 10844 bytes
SHA-256: 8286dff3d8ef3ed9c7cb7ceab611fe9bccd6d5040d8a240e22793a4855eb29fc
font_04_sfnt_off00018e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E8D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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