Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f8e134431989ee…

MALICIOUS

PDF

83.6 KB Created: 2021-07-17 01:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 710cdb566953bdd9e0d1b4f80b8fc1ef SHA-1: 56b916316eff183df56d060b714cdf62e498f6f9 SHA-256: 77f8e134431989eeb15798f61b4d8173f32b5d3a953e4514df06771d172c6c84
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, with numerous distinct hosts, suggesting a phishing or malware distribution campaign. The embedded URLs point to potentially malicious content, and the document's structure is consistent with exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b3e05d26---vofusaso.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5393a71b3---17907600165.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/11345818925.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a622866408d---jitefu.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/zitinarinorowiwafidak.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/pufatilakeredezodusuregej.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160edf46299cdb---71640522958.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1rf5krsqfngk8ltoavrtte4131/jifagukugezujalopek.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/rozizu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05887730c---rodotidakiwezofi.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/91733633741.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/pukadefib.pdfIn PDF document text
    • http://soupworld.de/upload/file/denekuwudu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/905qnfu2nnmc8c0e090ljle06r/76684247678.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/92c2f8f3d677da346b77fa495607b924/bilotosedusejozexilij.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/mejudizubor.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xugadikomopomozoze.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a97aa47ed270fc7451ca7971eeb46310/rirubiraxunogotire.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/117cb87a0b2982f16bdb61375e2663c7/40564625610.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c149eeacf2---tevitazawedaveziba.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/dawinewuzenu.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b2b6be7685c037410d66cf6e7ba612d9/sijunutetonegodedijiliken.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e7b8cc3c---11350012516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+can+you+be+legally+blindPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 16908 bytes
SHA-256: 1399f888636833533a94d36aaf74d7c6b7cd1212444a3af49ccf2dea551634ed
font_01_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 10612 bytes
SHA-256: cb09e7ec9f6c17cfea1789c9b3e308abd2520789d4f9801111a80af900ae5c7b
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1