Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa9a13174c3808c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 03:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8a247f2e4497daceb8497560a16b41f SHA-1: c1ae7b2b22bb051d69eaf717e35f2fb9678aaf6b SHA-256: afa9a13174c3808cff9d2eb8c35b8d20e4ad7460535331f9ce5ac2fa822e618d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF employs an image-only lure, a common tactic for phishing or tech support scams, directing users to external links hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a fraudulent site or initiate a callback scam. No scripts were extracted, but the structure and URL patterns suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf021ea5757---45749920869.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4ce1da1e---48835565648.pdf
    • http://thamcohoaian.com/webroot/img/files/46203871230.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d33708eef---sobiwikudatatebalufepida.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/47291151586.pdf
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/muxob.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3ddbcf98---51121022530.pdf
    • http://bellina.pl/userfiles/file/74302995052.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/80391ee8c08ef219e05a6e9639cfec95/94174491098.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/lixonunegizinovemupup.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32fd34df69---zatazefagejilafefilidojug.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/rulodo.pdf
    • https://campermagazine.tv/public/file/walotuz.pdf
    • https://maffart-guy.com/userfiles/file/59699976281.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec927752d7---zaxomaxekamavutogotox.pdf
    • http://dissanna.com/temp/fckeditor/file/39387257736.pdf
    • http://fine-cottage.ru/userfiles/file/12810832835.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/djc11l34n4sonj29sji674nf20/bidure.pdf
    • http://ghalemdi.com/userfiles/file/1445111800.pdf
    • https://muratay.nl/userfiles/file/sigidawuvafapizavig.pdf
    • http://adance0112.com/upfile/editor/file/17987785147.pdf
    • http://juentai.com/userfiles/files/94309615690.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2ff4ca4976f8903924c79d9b0dad892e/18838849133.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160980d35b6fde---52017089258.pdf
    • http://geostudio.eu/userfiles/files/rupufamilalinez.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fd59a14c30cbac321a0eea91bb2c924/41986910116.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+above+knee+amputation
    • 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_off0000b743.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB743 16792 bytes
font_01_sfnt_off0000cf55.bin
cdbd8bf4f2786400677144042683ae9872d595fbcc9103951fe55420967dfa44
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 13712 bytes
font_02_sfnt_off0000f0fd.bin
b3ef9ff5d4e43f4050685c83f723bb8d4a87ec7389d1a2d904f3ebc1b78fb4f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 10848 bytes