Malicious PDF — malware analysis report

Static analysis result for SHA-256 4758ac585cc2e668…

MALICIOUS

PDF

89.3 KB Created: 2021-07-24 19:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c987e9402bde6b359b6264f806a71b7 SHA-1: c4b72dc8ce092070605b9ec227b4694cf6a85ea2 SHA-256: 4758ac585cc2e66884cae7d6064e5168f7607f28d695575267caf9321310b010
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous unknown URLs strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63e504fd7---lonoziresopodetopuwef.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2ntl1cag9r2l8s817inf049hg2/38176005299.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jijaz.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/lalolukibizibinoxufoki.pdfIn PDF document text
    • http://safarang.com/basefile/files/novukuvutokozutoderegug.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/37090896433.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1332423829608bc2f368fc5.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9dc9730600c07e1f251f615aac801f38/bolugavesela.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843100b74e---nitipuwotosidilime.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hrlq9fou0hnvvrsve956dh8paj/23983603596.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/42976702053.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1emtc4khqtnia15rismjg2dmr6/74639353852.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b820928962---fivuda.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd2fc4a36---86295287088.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-11-10-14-43-55.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/60067605341.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/46272142687.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/43286993046.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/lumoritisobofabewok.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/qp3ibs501lq30umpu48qv0n91f/rodutamixirez.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/bgf603os5jh372mhm6osm4iiau/rejosokuzup.pdfIn PDF document text
    • http://liyangah.com/Upload/file/52973648385.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/vewenutiluwewat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=does+lego+star+wars+the+complete+saga+work+on+windows+10PDF 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_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 11316 bytes
SHA-256: 28d1ef1302e5db62dd8c2ebcbb035ef0472496ed74d21a12164c3b1301a024fa
font_01_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 17472 bytes
SHA-256: 194161ba9692b5beeaf4e9704d7dd26ef81f6302ce5d818a6cf10b3ebeb9a49f
font_02_sfnt_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1