Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1d8c4f81761892…

MALICIOUS

PDF

79.3 KB Created: 2021-07-17 20:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14d6cb59ec21d8a445623cb03cc93354 SHA-1: 5d8b48d7c579cfda41181546da188c4c9e611dc3 SHA-256: 4c1d8c4f81761892b32952a9a6b49f4e7ba9461b2ca13b7652e6694346be527d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e94684d66b1e10dde2b05fcb3f5d491e/61148249368.pdf
    • http://kashima.cc/userfiles/file/98737446697.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ebf2891f---bipidepexikukexuja.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/13j4o6ttskc26dksaja898mqfq/95798016853.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8s0t0q0b80m4b43jceohvempni/28054652036.pdf
    • https://przyklejki.pl/userfiles/33459878553.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae21630d3169bce82a3553fb681ded47/45648291251.pdf
    • http://youngshiny.com/userfiles/file/1621264500.pdf
    • http://blankheich.de/images/uploads/file/mativimevolu.pdf
    • https://allianztc.ro/files/file/82015138500.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fetibebodavawupotife.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f684041b5---zabiwagowomexopesijafetu.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080580d88155---45023235005.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/k4gnsf0pv7kjsp4s653sq3v852/61786326113.pdf
    • http://chandigarhdatarecovery.com/files/file/25017957631.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6salpva2ua8rdtuqo4ctlrp240/73614705582.pdf
    • http://lyzebrno.cz/userfiles/file/20211912707.pdf
    • http://namlongprojects.com/images/uploads/files/90857352281.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qu44at5mj5cjcl5fjf5qjfvqaq/dodemazabasebinizuzuj.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/77547754095.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65730561770.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3e966869d84182ca869118181ba65e99/26817956909.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8c622795---82758352532.pdf
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/60704638984.pdf
    • http://gernano.eu/gfx/userfiles/files/lawubajeguwiponaxurewulag.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/34017583904.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=charges+for+extortion
    • 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_off0000d3fe.bin
ece1b73b1f0862d73ecfe9c5dd2baaef68548a528cd8f4fc33925e7118a5df38
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 10580 bytes
font_01_sfnt_off0000ec2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 16792 bytes
font_02_sfnt_off00010440.bin
d6c1c5099679de90cda5b9be789f4ea55cac9573610aeb4a453388661e3c1ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 16880 bytes