Malicious PDF — malware analysis report

Static analysis result for SHA-256 035948d47fa9c4d4…

MALICIOUS

PDF

93.5 KB Created: 2021-07-04 11:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e0b5349de0df84e17e46a87510df3a1 SHA-1: 188166a89ef1a768de8010a45b7884fd26cbcf0f SHA-256: 035948d47fa9c4d4bb9c2e735b1a0bd2bd344820c6a8d98770e9e4aa5ca9068f
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. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious or phishing websites. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=cleveland+indians+starting+pitchers
    • http://ultraljud.nu/bild/files/doferariwoxujamoras.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3382d187---44184488205.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/44740817681.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ljsac1hiacaotin13fm3q8ip0/51855687942.pdf
    • http://magendans.com/imagefiles/file/38175764308.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607caac374a45---nipalarevirosakazakijuf.pdf
    • https://louvre.lv/res/wysiwyg/file/56069948718.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/42393678840.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa17aa0944---48257574911.pdf
    • http://oicenglish.com/imagexx/files/pimasiwemuname.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/23a82eb8319d45b53a1a7540e3f72437/71300978846.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/9ee56fb34a8a259e16413bb4fecc60de/47961101844.pdf
    • https://actor-conseil.com/files/file/vupasaxazevaki.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64c6793bea82315938efd17f7e2f682f/kirusobatututodamotokol.pdf
    • http://artospace.com/pics/file/98542986540.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/g2i0776uml4u45imcbfpqa8h1c/39036076157.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e09811196785f97ebc21176edd5bd62d/jurubeseguwupamuvuruxani.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/990b1a4753c45aedfdc1fa0cc672eb54/pepakofuxeguvej.pdf
    • https://narimasu-chintai.net/jcfiles/file/wadamidave.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160730bbfe61e3---99080177533.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/14a3315901aa990983e4590e706108e2/2000039407.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/68903866399.pdf
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/27049059490.pdf
    • 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_off0001085e.bin
cddedde9adb62f14f63402790781c980d1816f002e1c2b78d32bfba008c16b21
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 10768 bytes
font_01_sfnt_off000120e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 16792 bytes
font_02_sfnt_off000138f5.bin
00e89f1ff5c83d9761fb2bc877a17972a7a379c0488d08e54da15437053541da
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F5 18052 bytes