Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a951b41d95e5b1b…

MALICIOUS

PDF

80.1 KB Created: 2021-08-17 12:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61223053a1d345e58de4887dd829d62e SHA-1: 76f6d4327a19279f161134e9dfb9d4db5304af01 SHA-256: 5a951b41d95e5b1b652f170bb334142e9e9329e6d19612aa941b36821e225483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which appear to be compromised or hosted on disposable infrastructure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://archism.ru/uplcv?utm_term=finding+slope+from+two+points+word+problems+worksheet PDF link annotation
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071da7bd66d6---72653610775.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/83166141212.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0084fb21fb---44523902411.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9007a093---duzexufadoxiwusegi.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/95408612499.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7eb4a633341cf67e2fbe4a76e77518f7/fudozula.pdfIn PDF document text
    • https://wonkingchina.com/d/files/29614535159.pdfIn PDF document text
    • http://metricgroup.it/uploads/file/35410399777.pdfIn PDF document text
    • https://tigaintan.com/contents/files/vujiz.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/nuzodanax.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4aa4daf0ad23eb58177ead2a47123d82/9834918916.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/59830673152.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160998e707cb91---bimasulikadiwusafal.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/81788dc0a2549010d5d4d58c31c74a6c/82580483387.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/sulixobivewut.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082192cdd4ea---kelutakonitufabujanu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75fdaba3d---78511431104.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zadiverowofutebuf.pdfIn PDF document text
    • http://cwesp.biz/upload/file/lefap.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jopopiwixebofujuruvafazex.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/69f6c793418d3b4b80fc3b2ef27c5065/80015680183.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/78614811175.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/koxevufewimodasamadukal.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/99492889174.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/ritoxomagopopimaxipin.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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 11080 bytes
SHA-256: 9f1fead772586284cc5aa21c318f082ee30bb084ccc48ddb56b0adcc43a2fa3f
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 16248 bytes
SHA-256: 4f05db58ae359234f4b10db1e0a81d34c207f12b4cbbab836e622e7bb445ee25

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