Malicious PDF — malware analysis report

Static analysis result for SHA-256 778d57642e934c6e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 00:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdcf4a1533549354374066345e618025 SHA-1: 99c97ef5f8685c2d1c197c462ebbe0cd8c391853 SHA-256: 778d57642e934c6eeaf7e0a97840bd6ef240b241d85c14453ee3a964009ffb73
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=high+graphics+truck+simulator+games+for+android
    • http://www.anieliasfx.com/uploads/textareas/file/21147113069.pdf
    • http://sujitonweb.com/userfiles/files/wegep.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/xoxubasagapisezopeganewe.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/80349754216.pdf
    • http://zamel2.pl/userfiles/file/pedeserigatubu.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/refizubunopoxo.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e3ccdc52---wusas.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f35083710---lebevamoga.pdf
    • https://bankubezpieczen.pl/userfiles/file/wenagodex.pdf
    • http://7seapharmtech.com/Uploadfiles/files/48586750306.pdf
    • http://bigbulkbags.com/survey/userfiles/files/lawawabuwalojebojosawom.pdf
    • http://autobedrijvenindex.nl/images/uploads/49769898074.pdf
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gatagekan.pdf
    • https://pecintajp.com/contents/files/27385720371.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/vojakut.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/mozedivawejegime.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/xaneledabin.pdf
    • https://akamercedes.com/images/uploads/files/nujemerutokawena.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c16437283deeb58a86fad6fd6cd8f3a8/83918886122.pdf
    • http://shengnabei.com/uploadfile/file///2021091122510215.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/72223717893.pdf
    • http://psycare-spb.com/userfiles/file/60479842411.pdf
    • 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_off0000e254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 16792 bytes
font_01_sfnt_off0000fa6b.bin
43a4ba63f93bc58519490a4319b643fa7e636ae33e4f30516220080a9d340091
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 11248 bytes
font_02_sfnt_off00011466.bin
1c9ba05cae98b279ad8eae04d6893074d9c5e71151e63f2d6cab86afa070bfce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 16684 bytes