Malicious PDF — malware analysis report

Static analysis result for SHA-256 6913af141caa920b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 09:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 517679aea13425d4a8f733b36583038e SHA-1: 0d0104720e1651a3682b21391d8c3cf680d72b91 SHA-256: 6913af141caa920bd49c6464bab3468793d2e89c01cca7066ac52a33f5974195
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://architettoletiziamasciotta.eu/userfiles/files/77403077741.pdf In PDF document text
    • http://floral-design-lindgens.de/userfiles/file/fosuvadejegowujeme.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/vatujafiwud.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd6553d19---pituki.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/87925094621.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/69400530537.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/mitopajojub.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/nevakiwov.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b6e4b0bc9a170df5b60ab5377112eb8c/vufukuferajaz.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/11/54058815504.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99e6989a1---bumowuwexexi.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/xixuvowapefarisenajikim.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/40549786852.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa716319f93ca62971b31e5f4c0b11e6/kexazikevawelosofega.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/79161938300.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/65769042733.pdfIn PDF document text
    • https://okazionche.com/files/34277658483.pdfIn PDF document text
    • http://ashioke.com/images/library/File/dogatov.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/funamexorowigowodowu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddd3a27222---tirujevuwovifotutaxi.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xiruxukuvuzefeneri.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ec99f2aa---fibepizowulepufubuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=netgear+genie+manual+configurationPDF 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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 10588 bytes
SHA-256: 3610a95ae87a71308f855f45f189a861d383083d22b2fc70cccc60e2881a4f9a
font_01_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 16996 bytes
SHA-256: 588b3e24a9231d6975bfe70faf9adc2b6b050c65a65111837b8588026676f32f
font_02_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1