Malicious PDF — malware analysis report

Static analysis result for SHA-256 5787568050294f01…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5544edbac44d87a6f114a0dfa0aa230a SHA-1: 97387677b8797b11b27c75cf00dbbc1d13e6b03b SHA-256: 5787568050294f0176da26e6337b22aa4f59017c86dbe70a57e255dcd718d9b8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs, several of which point to compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://istocdukkan.com/userfiles/files/kepazarojomazakixabixeze.pdf
    • http://dyglas.com/userData/board/file/86183851630.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf30756e0---77136548847.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/of6560mgij51t2rrqjo1bod1a4/dafexiw.pdf
    • http://riccaassociati.eu/userfiles/files/56055481404.pdf
    • https://noddy.nu/images/file/81333035058.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607538d7b1928---kidafibukutopasawudifeg.pdf
    • https://toppelletmachine.com/d/files/zuvekijamujowa.pdf
    • https://mldom.xyz/web/img/podborky/files/dukogitixibekasalife.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c59048a5809---78036613769.pdf
    • http://assytekservizi.com/userfiles/files/rukidibejaweporumod.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e017f07688---gupofolutigafebobokuxotiz.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/inh6g623m17v5bcv6ggtujecg7/wuxevinotefixasizuboxedar.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/42363982987.pdf
    • https://keluargamimpi2.com/contents//files/mipapawumufaligumejana.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f3ff49255157418fe4e7c96f6360a08f/guniduxedadopekexa.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n4vtbvljncns6kgl822hdkaoej/49621472175.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/o32ni2mgjhqatsg5cafe6etcec/62369555513.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091a407d7507---tijovakuma.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3c5636d75a611af9b18dcce0c62a4aca/99525376815.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/88bd7df47956bd52f473e1ade7b0efb1/dagew.pdf
    • https://shiokerbau1.com/contents//files/zuzizozalewedewarazatab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+draw+sea+animals+for+kids
    • 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_off0000d576.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 16792 bytes
font_01_sfnt_off0000ed8d.bin
7b3945a4e5b8a328fa3e3be7752d17704a0d9c7d8af743ebf70c915a24f5949a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10684 bytes
font_02_sfnt_off00010602.bin
69f9f5e801ae7e29d9ad979ce5bf16e19af07c9697e6977d708982d6d027c2e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 18092 bytes