Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af0541296007fc5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 00:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 925fa9106a38c4a22acacadab72eed11 SHA-1: 46767433b3bab4a9c7b74b030410f708d93f34da SHA-256: 4af0541296007fc51228beea7bbd640fc0a496f39558ae1b06c604c3f3e4c208
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious files. The 'SE_CALLBACK_LURE' heuristic indicates a potential phishing or tech-support scam context, further supported by the ML classifier and ClamAV detection. No scripts were extracted, but the structure and heuristics strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hingliltd.com/userfiles/xuwoxezewasideditasaja.pdf
    • http://kimhoatra.com/upload/fckimagesfile/kolobagudavipisosim.pdf
    • http://tnetimes.kr/upload/file///9183803883.pdf
    • http://rollfactorytogo.com/uploads/files/kasunafukemirabewe.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d11bc0face---2861512897.pdf
    • http://usairsprings.com/userfiles/file/46276932555.pdf
    • http://optykglowacki.pl/obrazki/files/91910985972.pdf
    • http://s2group.pl/userfiles/file/14573052107.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/lefopago.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349605e93f2---xewojesiziwelulunono.pdf
    • https://nomaquito-travel.com/editor-images/41670267243.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/95918714518.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebafae61f---51220724495.pdf
    • https://hometeamcorp.com/images/usr/98681277454.pdf
    • http://budropol.de/Upload/file/34536878352.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/mijekatufolepide.pdf
    • http://jinruily.com/UploadFile/file/20210910210003536.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/24773505950.pdf
    • https://stradatextiles.com/upload/ckfinder/files/12898579331.pdf
    • http://daiduongmetal.com/uploads/ckfinder/files/30490211565.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71921304423.pdf
    • http://ge-mak.com/files/minizixi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=master+movie+in+telugu+download+apk
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/12868366978.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_off0000d72f.bin
6767c8eb98407dfc735506a16e21211ff4ce21046bf9d784d3c6a6be05433454
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 11072 bytes
font_01_sfnt_off0000f0d4.bin
0f609a50715c9c8ebd6a719eeb617473a9fa2e5283a372df2c5d767514f1ef45
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 18188 bytes
font_02_sfnt_off00011fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes