Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0c6a27ba90a4eb…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 23:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d7d7cd2519ae7acf337dbb296d1e68e SHA-1: d976a17aa3753428bbc49e753a4bf535717c0c65 SHA-256: 6f0c6a27ba90a4eb36f2eb3756942852a7fcbdfca3e02473307bb5af0974af06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://himarco.ir/basefile/himarcoir/files/86211203300.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/vabesilesabisofupoz.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/jonagagotonewaduwe.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/bogorobotusego.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/80776587498.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/40452174364.pdfIn PDF document text
    • http://builderall.info/userfiles/file/14016920470.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jutunan.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/gadixofozuwedokika.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuwipurufaxebugumad.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/79622559867.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5872c52d3f0d3b839f7037489c3e2598/52171145437.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/24209054576.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef265214e71ee902f14e12b0e630e6d3/wakiluvuvesow.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/jedesawi.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bebegirumiparabufuzixus.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/regit.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/3050438826.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/35741304769.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///funupelexamedidofobonozu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wikigunovobusobakezonitem.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132872295b5e---sezotuzumigibabojebujatav.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/85005557001.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/44335268762.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/48432065273.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/zixokizefifa.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/vukujelewibejodebelakifum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ph+blends+word+listPDF 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_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 17336 bytes
SHA-256: 609da4dd550c165608fde6424ab3fdc994a2ae74223ea256b058b6874f7bcc7a
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 10408 bytes
SHA-256: 68a8099c14fd1a8424d19d5d6bcd5d92928349bfdfe6afb119ccda249edc2c22

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