Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6741106b295e28…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 13:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f5354012d7256d954e02691a14363a4 SHA-1: ff4f92e3ea584a59369199495e46c039132dcf65 SHA-256: 7a6741106b295e2849f2ce756550a84b312e058aeda5fedb131b170dedb4f185
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd92d2019---14214582.pdf
    • http://sanyosushiglendora.com/uploads/files/28317040559.pdf
    • https://h1t-urlaurora1-turbo.com/contents/files/sujapirugalavumuxoxulibar.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c800434bc2---pitomoworavidagunew.pdf
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sodalosona.pdf
    • https://maria-galland.ru/files/file/papugiwo.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156293943464---retirixasediramokugetako.pdf
    • http://www.binghan.my/userfiles/file/59619079372.pdf
    • http://yung-shun.com/userfiles/file/27850124009.pdf
    • https://pvesc.vn/uploaded/file/3800643902.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/43587850253.pdf
    • https://dcimx.com/files/7171527344.pdf
    • http://dailythang.com/userfiles/files/sisoxadaza.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e17cfe48f9bae54b38c8c1e7758c991d/66399002399.pdf
    • http://nktrading.qa/file/files/razofezigelebavopikobe.pdf
    • http://architettogherardi.eu/userfiles/files/fisilexajutawefununim.pdf
    • http://www.deep2001.com/images/library/File/gixukero.pdf
    • http://yasairamenbar.com/uploads/files/tijoxafirasovosode.pdf
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/dolipirokulemijirukax.pdf
    • http://lidaoxc.com/upload/files/figekeloletedak.pdf
    • http://anabakorea.jp/userfiles/file/tizomazonitikawofewilijir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=college+loan+deferment
    • 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_off0000b0a0.bin
fea5b7d9592fb447ebe019ccd78fa24d8d00f08ef60a7f78dc0b35abe4d97366		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 10468 bytes
font_01_sfnt_off0000c837.bin
8b075a1f5c43050bb3cc5183897f11e56a3ec7702741aa357bd0bf8c3e9b2388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 15528 bytes
font_02_sfnt_off0000ef82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16792 bytes

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