Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a0b37109f10948…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 23:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c96ba86d97e3d1e653295ef1607c23d3 SHA-1: 45a3007774fe153025e16212bf7f83d79d6126ef SHA-256: 13a0b37109f109489e0242690582b69a9605f2c0e73f5847574d38995d9ea013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=punjabi+film+chal+mera+putt+2+full+movie+download
    • http://artpolinakuzina.ru/pict/file/35655354575.pdf
    • https://darshanam.com/ckfinder/userfiles/files/50111486921.pdf
    • http://briztravel.com/upload/files/14445733242.pdf
    • https://hotelangela.hu/userfiles/file/4442476026.pdf
    • https://verredistri.fr/xmedia/file/29298601494.pdf
    • http://gianniarnaudo.com/userfiles/files/7438855777.pdf
    • http://preciz.com/uploads/wysiwyg/files/jujoxulewu.pdf
    • http://esebtekstil.com/resimler/files/fatalapenedoj.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/85361826107.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82142037472.pdf
    • http://a-pluset.com/userfiles/ragutigodu.pdf
    • https://tjp2-hotlink-j3t.com/contents/files/91614773851.pdf
    • http://www.deopendeur.org/imgUser/file/30504769878.pdf
    • http://stroisvias.ru/userfiles/file/49724207675.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021090822490173499.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/9192071967.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613141d4eec8a---xemorim.pdf
    • http://papienbanana.com/user_file/file/larerokam.pdf
    • https://iwanbim.iwan.co/userfiles/files/31895265401.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210919180100.pdf
    • https://siangyun.com/upfiles/editor/files/migexizuwajudujiwovofu.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe26233b4---79697677791.pdf
    • http://dokumsuzgec.com/userfiles/files/suwazateniwolegasidu.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/66996436116.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_off0000e66f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 16792 bytes
font_01_sfnt_off0000fe86.bin
2a38bb749855d0d7772bf2deb85d425b1a34a466168731d652bb47e89bc9832b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 11360 bytes
font_02_sfnt_off000118eb.bin
507a087772921b3dc321ed3f2b8ad026ee1750290c1998cc43fd08cf09603888
pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 17736 bytes