Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57c2aa4263dc81a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 20:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74705f37631f36049d23ca68595f9ac5 SHA-1: eab90e3d0adf158e7efabc0f849cfbfb9d5fc96b SHA-256: d57c2aa4263dc81ad83b90b7f079d54dbe5492f2af7f3341be326d1a3a6410a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://meyanko.com/userfiles/file///78240219991.pdf
    • http://officinedesign.it/userfiles/files/banetuzutagilofekawi.pdf
    • https://debo-fit.be/userfiles/file///fiwujas.pdf
    • http://jjkxmy.com/upload/files/202109120118241184.pdf
    • https://natyabio.com/uploadfiles/wupaf.pdf
    • http://muaah.ca/userfiles/files/figawuna.pdf
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_064958.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/254c24a4f565e8b5803d7f63b90056dc/69005706630.pdf
    • http://kenhuffbuilders.com/userfiles/file/lodufemefuxu.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9cf86ece---karexuvitirulunogise.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109040000130893.pdf
    • http://hajnysport.cz/FCK_userfiles/file/6148297110.pdf
    • http://reelproductionshd.com/userfiles/file/21448300508.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/41982afe07effec69568e8162d01411b/63481566467.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/6379716566.pdf
    • http://faradbox.pl/files/file/87649882577.pdf
    • http://babamoleskine.com/files/file/77332619705.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9156a290f0e54e0cbad1785b131cafe2/pelurareja.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/47563673363.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/metogewunolevozorikufa.pdf
    • http://ourpreferred.com/userfiles/files/mujukunifemuvun.pdf
    • http://pol2-simf.ru/userfiles/file/40183906904.pdf
    • https://chptravel.ir/data/file/96701932017.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6db5985503f4743a046ce5310e54f379/ritejeku.pdf
    • http://www.hangmandigital.com/files/file/6675228916.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+block+calls+on+android+motorola
    • 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_off0000b3a7.bin
802c3ef8443aedcdf97d339d73073171877783851efaf39cff2e6a425b0f9f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 17892 bytes
font_01_sfnt_off0000e0f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16792 bytes
font_02_sfnt_off0000f907.bin
14943d813d8481124f13b7cfebc873b31f30cab56ca1c0ed1b84a06fc10ff328
pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10708 bytes