Malicious PDF — malware analysis report

Static analysis result for SHA-256 550a150c3be7ba31…

MALICIOUS

PDF

115.9 KB Created: 2021-08-18 01:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bc94806cc22668301cdd8246fd7b594a SHA-1: 90fc8e222abd2ddb7869cb472bc3c3642757736b SHA-256: 550a150c3be7ba31876090b1bdb70b07f6d7a663181cf4cfca1f892ae2646301
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to potentially compromised websites hosting further malicious PDFs. The presence of numerous links to disposable hosting and compromised CMS upload storage suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091531e9596c---fofipanafujilidemoxef.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/37756603303.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/77349502431.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822bcd1eaaf---19055358268.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sgavjfu87043ab6o02dq18nbim/jopot.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/terekiwowusokitaga.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aec9d99e5---2258739013.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fb57c8a72684ba1c931fcbc7cd772cd9/76476570680.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ec52da327e86462863c1f29ca4bf5f88/zotifosukozunajemine.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d8e19d86cb3a344e4e09641aaf0da3d/vezotafisutugage.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/85755349777.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/sabem.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/jixidovadedewawazesulor.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/tirizalavevemilov.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/da693933b3ab0b84b521ae242fbf6fd1/55416858499.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/34362349e1a83ff5f4fca052ee987e56/xuwuxoximizo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97939d826---88265617933.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/bavixumapek.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/73780031864.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/rimexul.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/gorozuxoselazex.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/cq9ubicvigu1q2mvda1ue5vlm3/vevusikekuwamokawebeditim.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/85412588866.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bdd8960384aee690e637fdf6b8c42898/fuzozibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tonal+harmony+8th+edition+pdf+download+freePDF 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_off000157d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D8 10964 bytes
SHA-256: 55b42310163067f78d0434e8d3506371caa65f30eb104c4a0fff920e9479d29c
font_01_sfnt_off00017130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18942 22000 bytes
SHA-256: d23fe776f773428d1c1165fde63a17de42296cb9d58df67fe24aa70ff708e87b

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