Malicious PDF — malware analysis report

Static analysis result for SHA-256 afba681cace4a92e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 04:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70aa26b22d46df8cdf8db6694826b6d8 SHA-1: 558f34be085a51162846ad2bc0ba9cce4c85a385 SHA-256: afba681cace4a92ee9cab614072ea9ce1da5cad4ab24901c415c88a5bb5515ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vindindex.nl/images/uploads/tijewedowoputexokuga.pdf
    • http://ferrogep99.hu/static/media/file/96923230957.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/sivakigivekafaneduxos.pdf
    • http://solee.cn/ckfinder/userfiles/files/33717633913.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/poxuvetowep.pdf
    • http://yonseri.org/userfiles/files/96755142848.pdf
    • https://pecsikult.hu/files/file/61254269467.pdf
    • http://sun-green.be/ckfinder/userfiles/files/35203995256.pdf
    • https://nisahanpin.com/calisma2/files/uploads/5361379123.pdf
    • https://guapa2.com/admin/fck/file/gogowezusepimigu.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/45736745822.pdf
    • http://studiopol.it/userfiles/files/88005430323.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m35cmnf1hg8bi155g4sv93c8bo/58722825716.pdf
    • http://smelawservice.com/file_media/file_image/file/pesisekizidasukamunazipel.pdf
    • https://reklama71.ru/upload_picture/3955502689.pdf
    • http://thunderstar.cn/userfiles/file/20210906031141741825893.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613395352e132---33314957900.pdf
    • http://easyreturn.store/userfiles/file/biwodufedaloves.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139131cb6627---52197082479.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/pemijalejasum.pdf
    • https://kingbakerypans.com/userfiles/file/jarozugisodakezumabekujep.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbaac1c18---12034283996.pdf
    • https://aquatrustfina.com/userfiles/file/90238043956.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b03c21dd---54230925193.pdf
    • http://glassick.com/userfiles/file/78885895107.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=como+descargar+musica+en+el+celular+android
    • 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_off0000cf75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 16792 bytes
font_01_sfnt_off0000e787.bin
7cf8a4b8a994ccfe638ccad2bdf5bd20ea5f86cf1e7a8dbd8ab6258641de07ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 18364 bytes
font_02_sfnt_off0001165d.bin
59ff253c291252632a4d715d6b4d53738abded7b4addb7c564e2cc891d8af252
pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 10748 bytes