Malicious PDF — malware analysis report

Static analysis result for SHA-256 16057cf353219d9e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 05:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 331bfa5e415b862a2b4a917909288ea1 SHA-1: e86d2aa50b240288997435f7ab911118d356e67b SHA-256: 16057cf353219d9e2b86a79127f359620af509fd2d940960a6c16347f3fc7c9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://7sate.com/filespath/files/20210828130354.pdf
    • https://kristinanamaste.eu/files/33397490306.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8221f3ab---12118679090.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4163667ee77a49e99303e0ff27475b02/wejadugora.pdf
    • https://maria-galland.ru/files/file/butavutevi.pdf
    • http://melly-incendie.fr/img_db/94864239974.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715d724b55a---63160269621.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6bc8843a9---pirawola.pdf
    • http://wojno-stal.pl/pliki/file/43737296084.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6d1379a8a1f0caa93e9a8dd988ce2be2/sijuwedugiji.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6de82e63c---kizonozazubowolavol.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bo7c6ffmjbj1qhj622vhbsa7qq/64038580789.pdf
    • http://telektrans.hu/editor_up/7390036196.pdf
    • http://www.niceresidence.net/image/upload/File/nasexoz.pdf
    • http://lsneotek.com/ckupload/files/pegazepo.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rrbkglkelig89nah8ttbn3ibns/linorumidutotisub.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/85465a94ffeb770305e0d1dbf3ded213/63419837314.pdf
    • http://zulaikhatextile.com/userfiles/files/83133936723.pdf
    • http://animationcoach.com/userfiles/file/97856334055.pdf
    • http://alnadaoil.com/userfiles/file/39876033576.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb51df08d9e---zuginopaxebipijivof.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/2da8e7edb9bcfd68ac6379cf212d5dce/wotuwato.pdf
    • http://xiaohecollege.com/d/files/dutumozedutakutefewepop.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a504aeb06---gusiforemeweduzonilifab.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea0995a2c---jagunolubobiniwevemu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b598d4f80---rataxegufogizotewelaxobud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=taller+de+cifras+significativas+y+redondeo+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_off0000bf6f.bin
a9ec762f7cb3ba71c7baf994345bfc90531bb89d3139ff8188802aa9ad215b77
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 18032 bytes
font_01_sfnt_off0000edb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 16792 bytes
font_02_sfnt_off000105c8.bin
ac3205b32db9f53be118ee72147ba51f7d83c3d22b66da50769d64e2cdcc7639
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10936 bytes