Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff628966f7627fa3…

MALICIOUS

PDF

88.4 KB Created: 2021-07-15 11:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52084ba7fc9e61a85baa536c9949c2b4 SHA-1: 658f1a077d02938ec1affa10b06fc33c3e414dcb SHA-256: ff628966f7627fa3d72dc3867020c95e7f544cb3477224a9fc3743b426a9cc90
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, indicated by numerous links to external websites, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://garglob.ru/uplcv?utm_term=lycopene+with+antioxidant+vitamins+and+minerals+capsules
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7e273f8ae50f76182fb52ef5fddc74af/zufifololadefevegigodena.pdf
    • http://www.zywawiara.pl/pliki/butomunowuzeworomovupobul.pdf
    • http://okzawidow.pl/img/upload/files/mawid.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b82027e---kojozisev.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b2636447b7f---84140032353.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/p2dmb74o8upmog2s521du73vk2/69387377641.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139c76b2a4---33266641722.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/79555194898.pdf
    • https://mimpidia.com/contents//files/dusikarabesijipo.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0c59c39e---lemilepag.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e00fc0d57a398923ffe0470a27ac3962/falodogaketipi.pdf
    • http://stalmost.pl/userfiles/file/97941091245.pdf
    • https://infiniteprospects.com/FCKeditor/file/toxesajopisusutog.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24301b03a9---52550879486.pdf
    • https://betenenergy.com/sites/default/files/file/bofedilebi.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/k8egoj9dbt2hekvpvghgnvhqee/ragewogavekoturakukinemu.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/sorilexumagexiliji.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d8103be9589a5753fad1e78c8cc4b85b/kudububarovolofezufil.pdf
    • http://augustaelectricalwork.com/editorData/file/vipaloluxavel.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c41e0266---vonebuke.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a090c8d582e---nuxijurokunevi.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vuwumuwevidesifu.pdf
    • https://renebeumer.nl/userfiles/file/59780418269.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be3c96e34---12592980785.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/65960932731.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_off0000f4a7.bin
d513d1ae14fb8f5abe56301df81c4cf50699d915b9cf256f6e9ee8eddda3dcfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 17476 bytes
font_01_sfnt_off000121d9.bin
decc338aa82c48aae53fb1db301a33b7ed57243c492b677e24d3557c7147f340
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 11204 bytes
font_02_sfnt_off00013bfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 16792 bytes