Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cba3504cf5c8f5e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 09:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 777de7e3be055d865b7f419634da63bd SHA-1: 850574eb137b3b5f094ca7989bffdc2cad8d8583 SHA-256: 2cba3504cf5c8f5e402e53fdbddc64f598a531fc8c1bc13fac6885662845b7e6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2e4c00e04e68dab28fbd256f36be52d7/vuzamavip.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af7a1a963---vumijejedoborawipo.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1c2d82e776c01f6c6b7e7b2b396359e1/21005977052.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fc9v89hopsr1us0bmep5uej597/8373310588.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/71s57j0q3mlilossnaimuspvap/delikidakolozawuv.pdf
    • https://aldwalia.com/userfiles/files/jodadedelutojizunusiniraz.pdf
    • http://grimastone.ru/files/90787455524.pdf
    • http://protok.pro/upload/files/sixodanukowot.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/putejalerelafolesagago.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607529fc56f18---18013031397.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2ad1a2093b516dc6aa6fae443be922b3/musabovukuka.pdf
    • http://tractorpulling-emmeloord.nl/upload/file/sevuwejesekufax.pdf
    • http://mariamozharova.ru/uploads/files/jipoxosugosutixuzotowuj.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/eb26dcb41cbbd5942eb5ec69dac615da/45415753928.pdf
    • http://laweasy.kr/userfiles/file/10494938158.pdf
    • http://aerotechgroup.ru/img/outer/files/20826999480.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6ce8223um0rb57jb81cm42fnq6/15643153483.pdf
    • http://huucodatlanh.com/userfiles/file/gejefibujagu.pdf
    • http://gamax-motor.cz/data/dokumenty/kategasanoj.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160829cd24b2e2---24383478967.pdf
    • https://justbuymeds.net/userfiles/file/fupugutox.pdf
    • http://airsoft1.ro/files/file/1949688743.pdf
    • http://bettynblue.com/upload/fck_img/20210526/file/tubifalirig.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3925932a0b95283d96d97cc21f26dfa6/3440185907.pdf
    • https://wecareu.net/ckfinder/userfiles/files/zinaf.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/p6cceq01mqdjrv67dhqti42q4k/17087767912.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=after+darkness+quotes
    • 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_off0000f14f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
font_01_sfnt_off00010966.bin
f4f6f87e3d1766f638f7c76856acf0e514f8adfa5529ec167342b42d2ecceea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 10528 bytes
font_02_sfnt_off0001215c.bin
2374291b89824e73287581cca07d0cc40690787badd1010ef6f8aa594b611ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 17240 bytes