Malicious PDF — malware analysis report

Static analysis result for SHA-256 e844f9d72746030e…

MALICIOUS

PDF

87.4 KB Created: 2021-08-14 06:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fee4ee494d8cdcea0e8379db0ee9cbca SHA-1: 728ec583b66a57c5b3e70209112f3597688bde5d SHA-256: e844f9d72746030ec8aed3f98b7bb34753e09850c527014496b6f10db8920876
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.yoko-ono.be/images/userfiles/file/zagorasiweruwimelus.pdf In PDF document text
    • http://samafb.org/uploadfilefiles/56423797260.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ccb520535498c6e280ccd7d23d646560/fokutivojetazijip.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bce5b29b0---98762236950.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b671fbef99f---penupunuwebapinukotuloma.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/benobopok.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/32077403805.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d146cac2a---legujixegefatetizase.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/31406292951.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/edk5rt3jhpjddl7526mff0uscn/niwakufekejamizuvobew.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/69245700466.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973a944a8ae---kaxazovixuvab.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/butumo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d841408f---tumexebenube.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/sewum.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/retapuninosoredufi.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/jobife.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ad6bf53---rirobonoxedudowux.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/74146304630.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d13b6c4ae606866b11529b55bb7d833e/pewivibikukedomenupupo.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/515d5414cb24689bcc74178a9d338684/36877236501.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/kunosawewivef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=current+issues+and+enduring+questions+11th+edition+pdf+downloadPDF 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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 11192 bytes
SHA-256: b1dee27ae7d743404b459b086441a0cdb43ae77a21fb3cb893a6acab746932a3
font_01_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 17744 bytes
SHA-256: 4760b575ff3023dad073f918a0df6505cbd092a9a3eb5b33b56ba55f1aef9732

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