Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8274acd5bf70a10…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 19:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df95479456a350f1b0a5b41bd20950a3 SHA-1: 8f5a1973150fa1f02e884f6bd23c81a53203599e SHA-256: d8274acd5bf70a10d13785b284ccc4908b37ab7079c74e39d3b78e19ba4b2f1a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially harmful content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/fffb7ba58f4a1da89a4dce933f7e55e5/74809026538.pdf
    • http://lookkorea.net/userfiles/file/54904588269.pdf
    • https://footballsod.com/images/ck-uploads/files/86926837370.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5d09df2f---kubotegurozexixi.pdf
    • http://benthanhsgfarm.com/images/uploads/files/91554577447.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9bfab666d---24725105342.pdf
    • http://stacjaregeneracja.pl/userfiles/file/kobegunejiba.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ea511d7a4---wetujonad.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e895fe2c24---13581848561.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2fa949d58---lujilezu.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/303hn9ivmln825aacli1h42d0i/sojagisoxeb.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078cff73f28a---xesemejijamana.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d74777a6---taxizoborumubejamuri.pdf
    • https://nanyangtextile.com/userfiles/file/79241530016.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wonojegusubotunuvupafepiz.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/36a3d876ce0038400ce60322ea1641d3/xomumisugawukuvipigog.pdf
    • http://davidlbrooks.com/clients/868292/File/84646209598.pdf
    • http://accessiblevehicleservices.com/userfiles/file/xoratetenuzoduxixetu.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/befe10287844a831aa9c59d920d9a5fd/vavizojatudigokipaxoj.pdf
    • https://attack.lt/images/files/kuwudikomomenetogax.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091433d6e7b8---77047625583.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/81953190512.pdf
    • https://okinawa4d.com/contents//files/ranov.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/bvh2jdkk4t98vkquprmioj50no/vipopawivo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=big+daddy+weave+o+come+all+ye+faithful
    • 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_off0000f4a0.bin
f922ef99fa1be39bcea77ee07ad013fa5dc8609e06b2370e63b0e287c19ad7ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 17372 bytes
font_01_sfnt_off00012141.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16792 bytes
font_02_sfnt_off00013958.bin
99696c10b45284aeafa21398d74ff9478d5be14c175c9f67c7e6f7bb3ec04109
pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 10968 bytes