Malicious PDF — malware analysis report

Static analysis result for SHA-256 3352a2875ffade0e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 13:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab4c8cffdf56e3288eb02cbf4556f3cc SHA-1: be1115ca98d43e176acd787d0fbb704e56d52cd1 SHA-256: 3352a2875ffade0eb99e6eb4fef5d3e7bf815392f1c5516a873e2ea41d7213e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by multiple heuristics and ClamAV. It contains a link farm with UTM parameters, suggesting a phishing or malware distribution lure. The presence of numerous external URIs and links to compromised CMS uploads indicates an attempt to redirect users to malicious sites, likely for downloading unwanted software or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=powerdirector+mod+apk+free+download
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12986186227.pdf
    • https://rubenoferro.com/userfiles/file/nasapapobewifukenunoxibi.pdf
    • https://royal-art.pl/uploads/userfiles/files/giruwodarame.pdf
    • http://opgzvh.hr/upload/file/53961051645.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/rozutenutenujarogijesug.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d164805a61---96793870098.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/90299810821.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/49i12rucupjsv0tvlr9v0vodq0/naxekupobizaxufag.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/jiwodarudabesid.pdf
    • http://gymostrov.eu/gymostrov/userfiles/file/somejofusojowija.pdf
    • https://mvpartners.be/images/uploadedimages/file/leleloja.pdf
    • http://www.heatandgas.com/EditorImages/file/zebatedomafuf.pdf
    • http://dakdekkersindex.nl/images/uploads/48591111894.pdf
    • https://polaria.cz/images/file/wawisibado.pdf
    • http://vizugy.hu/uploads/files/files/texurafififu.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/27612107477.pdf
    • http://newworldss.com/uploads/file/dufapurugodi.pdf
    • http://spartapr.com/images/upload/file/87074441400.pdf
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zezigugapowugaloxiwalemew.pdf
    • http://cioccolatogallucci.it/userfiles/file/susadalul.pdf
    • http://www.blueoak.fr/image/file/pumeriluzomogokedafobu.pdf
    • https://komunalno-vrgorac.hr/files/tumokusopoturepelarivarav.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/koranuxogakiwesifexoja.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095690bfa5---6106773792.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/85768648184.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_off0000e832.bin
d1c7565ff5bdcd7d0a28c5e3844ac77d2a1d342b12e96c5a78a5f7de12c72e2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 10792 bytes
font_01_sfnt_off00010119.bin
639f0605bfb11f703281ed0d796640b869ed7f3d1db2fb090e924a5c455da8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 17920 bytes
font_02_sfnt_off00012fce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 16792 bytes