Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bcf4d3e0ff4dfe…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 00:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdd7c3f273c8c7f139bbd6953ec87b36 SHA-1: b4f7dad85741626712e94afd7ad6daf08b28c9a2 SHA-256: b7bcf4d3e0ff4dfe2c9045944aa9cb49374b7b67848dc1f803c94423149c9744
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links suggests the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aspaeng.com/files/image/files/lutumilokagid.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdqv2fsdto921dc44ohepprtbc/16462512213.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1a320d94fecaff24e8eb865f4e74d024/37942826498.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c9d5e9ce---xufujabepaso.pdf
    • http://waukeganeast1980.com/clients/877304/File/zelobodifowozobelumadit.pdf
    • http://arch-teh.com/pic/userfile/68814053233.pdf
    • https://confetti-seasons.ru/upload/files/28957419618.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i70rvam7v4d0eknljft5d1bdp1/juxufalefosidorokide.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9042a59fd---7890898940.pdf
    • https://bednidhitraders.com/userfiles/file/febosenuxipikoredi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f6b491f4---kadivoneribibibirebiru.pdf
    • https://chief-moving.com/editor_upload/file/nagugara.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086f734c901a---32019668232.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1f85443vsb92pd2sg06j8d0qqs/mofisom.pdf
    • http://kripasec.com/userfiles/file/vezifokidabupijoxiwul.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/719cfd1a6f5d04baf3631cfbd1ec302b/zifosofonulakon.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7ab4f41bd8eb8581edc1ebf9a357c8e/lubazuxufun.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bacaea299---85655847347.pdf
    • https://eletmodguru.hu/files/files/darejek.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a382d471fa---63080030220.pdf
    • https://stopserv.ru/files/file/pujesabubowonibevasi.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c2ec17e8---71707309910.pdf
    • http://jrpst.pl/userfiles/file/23642700713.pdf
    • http://airelimpio.mx/img/editor/file/ridixamujofidetusabu.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeab11b54a---tuligunisirup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=time+on+other+planets
    • 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_off0000e8ba.bin
28e68c3d5a5d0c81bc01958e26be0580a5a9a30b3df1015738b339e9c69de05b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 10480 bytes
font_01_sfnt_off0001004c.bin
d82bc3c8136e1915723992a076142593eb39392dc17b84dc3248028c6db16542
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 17572 bytes
font_02_sfnt_off00012dbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 16792 bytes