Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b6f0172724dfdc…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 17:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23b173c03018366999f287df4cab975f SHA-1: 1940accc5e230121c22b3d2e4d4fc17b2f9bf317 SHA-256: 88b6f0172724dfdc0abcd9fd8b4ff51753b627b51d9df5d79dabf63d680ebd3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=kompas+app+download PDF link annotation
    • http://nfc-lampang.com/user_img/files/27373024057.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/rivisenanepoguwaxalifige.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/79227944298.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/46725152386.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/jafiloj.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/senawino.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/15644216569.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/27847958542.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614013514b809---57377107461.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/13475381161.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161300450764a8---kojalosufobum.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dotumeganaluvopukamote.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/17037995173.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/02/file/mukuto.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/83639937692.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8d399a33c2a8278ced2a4ca76cf76e41/96090626153.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/jasipiwibadod.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/18932550425.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/mulozonutowiwipodediga.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/juvipegina.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/majeragozepugupir.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vosusarakamexiw.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/telijusexev.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/113940153761350de37270f.pdfIn PDF document text
    • http://land89.com/ckupload/files/taxareta.pdfIn PDF document text
    • 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_off0000c150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 10208 bytes
SHA-256: 906ed60eac839c2ed58dda43519802909d397ba4a7b6de5a400b228ec2730323
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17960 bytes
SHA-256: 6a7d028952fd37e3a513a503b0f6579b996c93cee8bc23cd34394604eb7ce04c

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