Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce815418f62d7c27…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 20:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 458d70b7fcff6d59dbaa6c0c125b9845 SHA-1: ecc8d3dc958ab1f8cc1c85a5cdd96d679b56a6d0 SHA-256: ce815418f62d7c27827dda74316485cd9ecb637619b3725f6c23163b1c44eff0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of multiple suspicious links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://apexhealthnutrition.com/newerac2c/userfiles/file/nodilivulukogalorafudinus.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df303c4b1---zopurelategilifim.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079785f4b25f---88412123553.pdf
    • https://dollarplus98.com/images/upload/files/57221678315.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608676f1f18fc---21343766722.pdf
    • http://buergerforum-tirol.at/file/183142304.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50553c9f0---terikoze.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/94c4eea04f4c775a786f7cd4abd75c29/vipupuwalew.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/38131773820.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/72f046b76453aa926d45f904bcc3c5f3/90763612925.pdf
    • http://chalappuram.com/userfiles/file/madunukamekewixojomig.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3a1021d2ac07d708130034bc1faa4a7c/3832098714.pdf
    • http://camionespanamericana.com/userfiles/file/43821587719.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/57311ddce5485209ae91af0e3e504dca/lafokezoturafojut.pdf
    • https://thefertilizergranulators.com/d/files/48958486925.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4utr75475np4i6lsfn7co8coh5/83560345263.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436c0cd3a9---janafarazidofuxesal.pdf
    • https://luyenthitoeic.info/userfiles/file/dizobemefavufujovitotavop.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/r2lvjbdritab4b4uo62m2tmhna/22377847447.pdf
    • https://vigiweb.cl/dinamicos/files/file/97427645896.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d12c9320---mizegagowefizuzoper.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f0be6f90316c52c357aa80a06695a58b/bunikowaji.pdf
    • https://fwullong.com/upfiles/editor/files/dubuzugogi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+two+fold
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001503c.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1503C 18328 bytes
font_00_sfnt_off0000d843.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 3464 bytes
font_01_sfnt_off0000e5be.bin
30ba77d6eadb557700a7c3acdf8792e1c0f8ae57f63c14b4cb8e520f250473de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 23852 bytes
font_02_sfnt_off000120e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
font_03_sfnt_off000138f9.bin
3f66d7c84c3bef7d2f69195c8f670fc60af8e19732f666351adc7d4311ee25b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F9 10340 bytes