Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a4be403dab9d1…

MALICIOUS

PDF

87.0 KB Created: 2021-07-05 14:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02dba254c846b50c3b0db0e453a67dee SHA-1: 7ad974399552496637cfaee52fbd7ddbdc633f94 SHA-256: b18a4be403dab9d199a1f290f80fee25eaa89db619f3efd027355b1300475d84
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are designed to lure users into downloading further malicious content, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://skomi.ru/img/files/file/wosatapipixegeku.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/29j17vlh2sefa7t6v50c55ug3m/vatidewudikubogaze.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/o6h0ag4dtvq45hu2jphatgrkub/wunizodezedaseliju.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c02bef500f5---81279002666.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076106c002c7---17675300521.pdf
    • http://interno-kazan.ru/upload/files/75562147703.pdf
    • http://pnmanagementsolutions.in/uploads/30241566413.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/188e238ed248ad863af12b27cfa557f9/62658982921.pdf
    • http://sosnovgeo.ru/userfiles/file/vuviximawiket.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/famigezifolunidab.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abeedd85ed9---97169262044.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/02c5652becbe69861e8064292b116ef7/42105628953.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c017ee11cd8---soxokoludigamo.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k3nnt21r5ch5fhtmh8ocah6rko/bodoka.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5jhir24476aocl7iql77s7da24/jimepisulewapud.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lrjfk9u1d6nr4htm7cbaqh23rf/fazapetupulopiligenozu.pdf
    • http://emirates-offshore.com/uploads/image/file/15932284520.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609046f7e11c5---sugegituputum.pdf
    • https://artenika.pl/fck/file/wamovowoxubepisevud.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/12830aad6b4e466cf64460ba962ba540/minutamifiduxo.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9bac68e93---23494363470.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/04df5788daaab42db79eca4a9d63a18e/ramagesev.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dc958a69d37ce85f9da77fd4639c55df/kunabudesul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=wolfram+mathematica+tutorial+collection+pdf
    • 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_off0000f192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
font_01_sfnt_off000109a4.bin
e16da0a1a8fdedf700d4f7f9c1ae77e7aee1c77aa41b4c0c1c113d45bc9f0341
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 17004 bytes
font_02_sfnt_off000135dd.bin
8652704860b2a7faed67a308dbfaed085ef3f6484f2251c6192df700b7977d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 10812 bytes