Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a3bfb372aba867…

MALICIOUS

PDF

74.1 KB Created: 2021-06-29 01:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6949baffee1911ecd3fbcca11c173ee SHA-1: b7251f193b4c9c3d1bf2ddfbcaf047475c636704 SHA-256: 32a3bfb372aba8673989b1554c9ec29ea7553378230bd09ee72a2dbaa8aea303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7csnb75mva98o2mhpu3f1u5tvt/tepukatoxidutif.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0uosih25a5uh7ka6dl8g21ri8t/zafuxun.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074b779a2df0---kijaxudizajar.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fcf50ec23558bd0d961472d4c0cd5e1f/velikazuk.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/kemerafobakikared.pdf
    • http://ouhkpthaa.org/userfiles/nigumipelekepiposadewu.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e68e5afdd2---19232233044.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2d9f02ac19c2e645403c436f35d0e09c/xatuwagejulite.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dd82d2a2581a88ea5152e6d4c776da68/73343554191.pdf
    • https://airflow-skateboards.com/upload/file/lazizitubobosemusedomof.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa833b5a24d---53868240209.pdf
    • http://aaaexpressheating.com/userfiles/file/togizatizazawer.pdf
    • http://taispacedesign.com/upload/files/2240163627.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070694a61a71---wafitowabadew.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c19ce03130---9107218789.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/367d54e397a36ce67a91e5bdeea530c1/funarafipavaninowuxuzi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d74645ad2c05db9eb8c099aeb96aea6f/4234824697.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/gakefafofosud.pdf
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/29449781711.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01be500f7---74969855746.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1406e282---zovirivotirasixazojomazo.pdf
    • http://cecev.com/stockages/files/delomedaliwaxakotupidig.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072990f4f988---notusenugoji.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835ccdb2b1---xowesesigivizuwukuxumawe.pdf
    • http://goteneplast.se/files/images/file/41871461305.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=h1+null+hypothesis
    • 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_off0000c17c.bin
22cafed0359a9878bd4f910f0cc4c5b8fb29b5a30e6e733de077027038619ddc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC17C 10344 bytes
font_01_sfnt_off0000d8c6.bin
019b6649e24c0eb56283cc6ed912b24ac65e78aedac55e34eebb34663bc5abf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 16348 bytes
font_02_sfnt_off00010346.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 16792 bytes