Malicious PDF — malware analysis report

Static analysis result for SHA-256 571f8195e067820d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 04:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bebb91e824802db2b90a31203d7fce27 SHA-1: 258c0f1864a75c8b0ce93e43a5ef4e7cceeed5df SHA-256: 571f8195e067820d5eba99cda3a3d2d76fb15134787bc72ab3abc3b3512f7abd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075903b940e1---53566494153.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080902fa1c26---54385616678.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/dujijizidoja.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/pewemowidifadawugubatoxo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b455bdc97a2---valonoxig.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9f49d765de4e5a69f4a1be2ad1a78a63/32075712850.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a75e00a2c44299e3e9a6ec71005f3111/66170842639.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/bozuku.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaeedd5a3e---nefoz.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/dovatew.pdfIn PDF document text
    • http://momsystem.ru/public/file/dixewefaxusiloxelejiza.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/533873ee6e17783f2ed9bff6c443b958/diranuk.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/t2bc3li44ak4bu7gd9j1t9kjs5/gulirisagategukutafumid.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/86468262193.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/bejakeda.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/81836819658.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/19049644975.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/31748078253.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/dde6b41f4002168558dd2c3ae6a06315/tasutanufulubamuvewipufa.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/06dc1de732e04febd243f58cd81bbea1/wopivawumudarez.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/rusoxidifepizetelaj.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f86fa38---52284718485.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/691680963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=russell+hobbs+steamer+manual+ricePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 10780 bytes
SHA-256: bf65a3c789ba118913bdaead4ee03502f4bca5e507d4f3b89539a52b56e9edd1
font_02_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 17436 bytes
SHA-256: 266629c57ef8e7afd4474904ef2c6518f8d8e7dcc0ab8c95fb0c2623964ab2e8

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