Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c2e21327a9056d…

MALICIOUS

PDF

73.5 KB Created: 2021-07-21 13:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a375f671279ec3902135ef55acaf06b8 SHA-1: 10315bbfb6e2273451d1f3bacdb9cba44fdc75b4 SHA-256: 91c2e21327a9056d77b495646614469515b8cd10eff8bc11d333052b6920d5bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://aljazeerahpetroleum.ae/userfiles/files/53684181838.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/50c5308d4f2b4d43645cf66c1de19fc9/70442845823.pdf
    • http://curry-box-deluxe.de/userfiles/file/weregavemiligapububawi.pdf
    • http://zkojicin.cz/userfiles/file/35902709821.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/65c27a2236f3a71bc165b5f9bb46a09f/nubatof.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfda4efbfc---36571688643.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/10eafaba08b4db1b140e54be8158e86c/vixotonifuxaxodax.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cf45c03d---gafononexududujapagavugi.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tg7nhnqt5pcplvhss9ct08noea/ridujinuduvofubuvakidix.pdf
    • http://ouhkpthaa.org/userfiles/65703132520.pdf
    • http://mg001.cn/upload_fck/file/2021-5-23/20210523091003168797.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/31702869200.pdf
    • https://hunde-katzen.at/soubory/22287647925.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/5vm3pjnfk4nk9qoip4d2vnjmmd/49520972029.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/p7s8r6h959kai54322p1mufl15/ganoletosizikunepaze.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kometavipezo.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df77d7be48e---97521983853.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdddc2031b---89470180909.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/de656196a8b6545999d9363ee3f85fcb/61250922537.pdf
    • http://rent2day.ca/ci2/userfiles/files/83467627661.pdf
    • http://obasekiestates.com/UserFiles/file/78135150528.pdf
    • https://luathoanghuy.com/uploads/files/vosijewiwomida.pdf
    • https://studiovizia.com/webroot/img/content/files/vurosewep.pdf
    • http://mtjjt.com/2013/upload/article/files/210627214645365910byvij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=slope+of+speed+time+graph+gives
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb6c.bin
b3475b4442f27d6aca2f864125ec44722bac1a9e55af8bb8b06120965ec832be
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 16360 bytes
font_01_sfnt_off0000e5ce.bin
82d496488506cab436df8173fbddd44f8798070aff07f9264381e077c9ed4f9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10984 bytes
font_02_sfnt_off0000ff18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16792 bytes