Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cd875175ab3585…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 00:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b280914f0b33a5b13da467edbc5ec601 SHA-1: 73990e9ab360f06133bec22ca869e34edd3b2d62 SHA-256: 86cd875175ab35856d88065c28ce06303de0b759adbcb88f2bf13d96d5308f33
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents as landing pages for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hatowo.com/app/webroot/uploads/files/gamokojunanuwetakiviwedo.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e9270265c1079ed612e2c92e10de05df/62054418873.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/i36nf2jo3qq9fd63du3dbk0mid/temew.pdf
    • https://peiitw.com/Upload/ckeditor/files/22368653047.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093162c0a27e---putego.pdf
    • http://zrdb-drogbud.pl/Upload/file/84950625660.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/97d72b9cf99432daf9caebdd516b5ae1/mupikexaguduzatuje.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/94774c8001dd3bf7954944aede7d3ecc/pulipuvitesakuzixatofetad.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/9f91ffe4ecb59b5de10bfecb948427eb/biremuzolel.pdf
    • http://skomi.ru/img/files/file/50704973748.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8f261e767f80e237deac7a9d8ec52d92/45902485275.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0vgk9cgaoso47of33olfo2kf6c/rujifajimiwexuwafenus.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b117f079e5---72695019881.pdf
    • http://mengnuanua.com/app/webroot/files/files/taliwikabujedigi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t4dqmdbkoilfvmg5hdjjpavsfp/zifixipifetalaja.pdf
    • http://www.srijonihealinghome.com/fckimages/file/24176117488.pdf
    • http://beastyenergy.com/userfiles/file/rikop.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1544aa32e---96853228850.pdf
    • https://driftwoodcc.com/userfiles/files/nigaruximuxafisuvisij.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8c6767396949edcafb0342a3c4cd6ba4/25994919177.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/973425cc473506624fe3ad7f971398de/91625682995.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c7073e73---86848809961.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+become+a+chick+fil+a+franchise
    • 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_off0000eb82.bin
fe046b0ca37ee9a2bf9ee5ac28c9344a39f2cf4064dcca24fa77c20285066944
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 18472 bytes
font_01_sfnt_off00011c1e.bin
492d3650e687d64091d396a425d192d1e5b0359a43d1a7cd73acdfeae4649de8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 10908 bytes
font_02_sfnt_off00013534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13534 16792 bytes