Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3b53198434486c…

MALICIOUS

PDF

123.0 KB Created: 2021-06-28 22:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ed47ef71df4ac55958ebd4c96b57488 SHA-1: 7f055c5e3d9778b40fa2c10ea4110cbf02c4884d SHA-256: 0f3b53198434486c8a059c841858946f2479ebadbf94dc708da6cf2a7dc8d68a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b578fb44672---90996737348.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894fa73d798---jujixukol.pdf
    • https://hostingalani.com/calisma2/files/uploads/ziruluz.pdf
    • http://bet-balance.com/userfiles/file/powedononipasituvovepaba.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/g108ae58m6uva8a7tvp188ubrb/18510262119.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/15920171249.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/423054d27106f1e60709a607fa2a8c18/45005114036.pdf
    • http://imaginove.eu/data/Files/lukopigusizukofib.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd66e9e5dc---15306819088.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609407beaa880---48764420593.pdf
    • http://ingmontagna.com/userfiles/files/nivogosobemafoxojuderot.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868cd74c77a---komijobamuzudenesugat.pdf
    • http://loveperfectionschool.com/upload/file/ligipuso.pdf
    • https://condominiovillage.com/userfiles/file/61265233593.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a7011162---wawigodalumujafuzokob.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe1b0bf6cbc3aa8b0e7687ac204975c5/6002653664.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866575e201d---5362862061.pdf
    • http://dush-kz.ru/uploads/fck/file/92704239832.pdf
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/pafemebibefinoxajevekep.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c168c71b22a---lipisa.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/c3eeaj6ua8vjf6nsf9huml4e05/31389449671.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b71760a138---60414559753.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac632f9a572---rexab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=if+an+organism+diploid+number+is+12+its+haploid+number+is
    • 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_off0001743f.bin
b9c38222c931ad22aace53454efb3c459e4e1abb907fd3de4db37386216b909f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1743F 22016 bytes
font_01_sfnt_off0001ac28.bin
2f360f597a7ac19c237811443dd9b67d636deeb92129e9bc2a0fc19cf0091277
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC28 11308 bytes
font_02_sfnt_off0001c62f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C62F 16792 bytes