Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d6e484de15debb…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 10:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fe671647fe85e60d32982d9f1a33a90 SHA-1: 6ab32e6b76cdc0c9ac93e83a93ace6f97294a24f SHA-256: 10d6e484de15debb5fef412444eaebc8212b24cc2cf94028a03ccac39c40e3bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to lure users to malicious sites. While no scripts were extracted, the presence of external URIs and the overall structure indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://joesservicecenternj.com/userfiles/files/mejulopamusunu.pdf In PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/sebew.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nutejawi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94813a733---6277013886.pdfIn PDF document text
    • http://elpijisystem.com/file/fixojipivetavaxufe.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/95501457713.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d437eccd889---jotirutigog.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/mapilupekixekuzixako.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f33c1b07c---kuwifupidaxele.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/810ec92851a75d0d5184c89001500a95/xevijamovojiwaluwibugo.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/logekebaxut.pdfIn PDF document text
    • http://aqcons.vn/upload/files/wagedojirujomajo.pdfIn PDF document text
    • http://nova-auto.com/upload/mujux.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/63612225668.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/98b9a8fd8ebc99d31ecb6de1dc905ba4/zabemofixejaguligul.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/806dc73930dd6f06af403b495f378a82/3253383097.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84a9d481e31f0c8d957949d332395e42/29249538673.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7787716edf---domona.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/gupiritikaki.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/babunafire.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210624104140.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ded67f5fed6---16640425221.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vegimilakedigusuritoxopi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/99623687420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bi+curious+meaningPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D2 16180 bytes
SHA-256: a960219b804267f387eff7b86153ac0e4fc6c1f8a49d4d7cfdb71abb9dc8f547
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10584 bytes
SHA-256: ab7d515e48104516feb646dcb5b213dc29cab0d79e300dab7a6af204c4db6d60
font_02_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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