Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d29e716cf88e0f…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 11:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66e3e64d0104f5329f123cc27d07f302 SHA-1: a782061c12d1a21d28920df570765a1af80de71f SHA-256: 16d29e716cf88e0fb3cabae5810073faa5eeb4498018b2ceb4fa05aea5bb60a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites and disposable domains, a common tactic for phishing or malware distribution. ClamAV and ML classifiers also flagged this file as malicious, indicating a high likelihood of malicious intent. The embedded URLs suggest the document is intended to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://abe-rdc.com/userfiles/file/wamemisutefarojelufuwejis.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5ggbqhtf8jhinlddt8rkfk13h4/susuviji.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/bagofis.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/20d1dbccd4578bbe651adb25965623e2/80109831581.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/pesija.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/18911879942.pdfIn PDF document text
    • https://promise-land.com/upload/file/jexaxigebikuwitokigela.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5736ec27449b9cc623975ce277913da3/seloxomakepufovitoxej.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5fc2ff2b0716602c3136dd577b786e47/jifaforovalobusiposo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/23777d07c5bdb825d3070642684feee3/podinomezafomot.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/1pbeoqga3dqhrpjo3ovajrni46/81147377472.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/gidafinaf.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/47359901727.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/vuzebip.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/dc26cd7c71310baa4d1a94fff01405f8/77602574960.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nexupek.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/58768433646.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/jejurimukanikulaguxo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d37d04cf88f---futidufalazezal.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/kulabuzapap.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vabewetijupuzufo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vobevawuzapiwiwiki.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/aca7b14e509b7e7dc690f426195dfd33/7995762868.pdfIn PDF document text
    • https://bnovum.hu/downloads/46136207151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=divisible+by+4+examplesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 17472 bytes
SHA-256: f8a7de5ee24e69dcf204be5b8373ab3ec4322567342cee32a4da8abc75ee3cca
font_01_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 10492 bytes
SHA-256: 5cdfe0ec33e3ceb4b00b53e8cd7e38cb72ffe5c240c69322e73d2a93eee016f9
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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