Malicious PDF — malware analysis report

Static analysis result for SHA-256 8961c16390054fa0…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 02:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97160d0067b01e94d1024b3c44616a55 SHA-1: 23e970b01a008b92d47baf6a18aa6c70205b9297 SHA-256: 8961c16390054fa0107ffc7ef8fbecb8e665dce2c129e5ef542c84893eef341f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d143ada08344c33335de3d9e8a478aa6/33972280311.pdf In PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f22f80f6833b57186bb21f1aebf0f0c3/vavufumoximigalipoxim.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090421d5edba---461461384.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c14076745fb---29412409377.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/wovivedu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc957cafbd---wunepejinixewumed.pdfIn PDF document text
    • http://jucal.es/images/file/saladanefuxifowodiwaxixa.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/4981360df44d169c28086d6e05f2e12e/jubigapulitafo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fntqls2a5n8rr4o53h50afb9n5/lepidavo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6afb2293293ee44597ef0ad3b5462e3a/pelogopul.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/74589550548.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/637432101a5c5e86af0a37dffe08b490/sonajizizixo.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/julobixumomat.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/4949ef7a106f5e1543f5d84529cbf06a/87575123906.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f2923438---jepepubaniwefe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/54ff2dabb532f377266790d0bf10934a/nogokop.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106221942067833.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/13050871777.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nccoi4nh8ul3kjmttkvg3738pq/29838521717.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8e1b0eaiemjfi7ndi759t0mglj/72491080613.pdfIn PDF document text
    • http://vodnik48.ru/content/file/poromutigixabixi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c615d7233---lazugawexetejoluxulowolux.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea1cc303283a3d5a848a15ae2378b5ac/52116313377.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/zunuxatuwij.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160adb43deac83---xukedo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/45814198894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=verbo+to+be+past+participlePDF 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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 18868 bytes
SHA-256: da8db63043da73cc0678d6ac392af6d6c02105739cc47a5fd8ab93672dd4bbd1
font_01_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 10372 bytes
SHA-256: 80ac2bc087a7c0e5349a46efa2943b0431474ac251e346dd282e01efbce6f020
font_02_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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