Malicious PDF — malware analysis report

Static analysis result for SHA-256 480ba2a7c2603f43…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 00:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29caeeef961b0ba98c37ff97625b426e SHA-1: e52c621e40d6d2d88e0e17434814ebb654c69643 SHA-256: 480ba2a7c2603f438f34d4b1aee2d018ef90a6da7367d48f7298a0275c249f68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm with multiple external URIs, some hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=g532g+firmware+4file
    • https://reklama71.ru/upload_picture/forimabolojifozano.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/63671975350.pdf
    • https://thuaphatlaihanoi.net/uploads/files/94323322150.pdf
    • http://duet-czluchow.pl/userfiles/file/refuk.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-9-16/20210916050044700153.pdf
    • http://bannhuaduong.net/upload/files/wadutiruxifipofipakegugit.pdf
    • http://cjmfgx.morefriendship.com/upload/files/zafefini.pdf
    • http://studioingtassinari.eu/userfiles/files/fakemivatetolanazev.pdf
    • http://tai-yang.tw/taiyang/upload/file/73242740840.pdf
    • http://idominjazz.com/fckeditor/userfiles/image/51738489656.pdf
    • http://mannaz.pl/userfiles1/file/45757272364.pdf
    • http://huile-de-nigelle.info/userfiles/file/43140913747.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/9361573976.pdf
    • https://wineart.online/userfiles/file/semotofifadukesukogatine.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc602a644---16782234669.pdf
    • https://angkaganjil.com/contents/files/jurijopepilowuv.pdf
    • http://ersenergy.com/UserFiles/file/10677242170.pdf
    • http://dreamcatcherltd.com/userfiles/file/56033813509.pdf
    • http://nationshield.ae/userfiles/files/81630564874.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9400a0b0a58e0bb66d6096cc97556bb4/vilazin.pdf
    • http://poexali.org/static/image/_u/system/files/jukapefenafozojafugaw.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b76e611e---wipasigipujujozuxavana.pdf
    • http://s4l.vn/storage/ckfinder/files/33819442244.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_off0000df64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 16792 bytes
font_01_sfnt_off0000f77b.bin
fd566e22b74277db59396d806d15b31ee5632ad6e03ae197834672935a879fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10696 bytes
font_02_sfnt_off00011030.bin
21bf597c03379dcc2a657aa1c6123401f394edfaa5cfb43f6daf02158d2a2b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 20576 bytes

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