Malicious PDF — malware analysis report

Static analysis result for SHA-256 9774981ebc0912f6…

MALICIOUS

PDF

68.4 KB Created: 2021-09-06 00:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5d580c6f5d30437db1ad780f904f161 SHA-1: 89d5cb3db2ee1a85de6e731ff1d5d105e6d5b6d7 SHA-256: 9774981ebc0912f6299b68f9738e9c8862dfcdcef0fd5b957a034e3fd7864021
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware distribution. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 68 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.
  • 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://synerhu.ru/uplcv?utm_term=comparatives+adjectives+list+pdf PDF link annotation
    • http://the100voicesofgospel.de/fichiers/newsletter/file/453022610.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/67125700730.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b3e51585---pidesaweroto.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wogodoxedoxigijoki.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/zupijivufaveda.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/nodajazibasisumiduvaluvid.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99727a763---kukes.pdfIn PDF document text
    • https://csn-alliance.com/data/files/90501463819.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/98006372166.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/81040086403.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cc9bc271---wadefer.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/danuwabozenalipuf.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/55703974571.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/xuzuro.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/wudok.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c916a6178fa---posujixotuvazowanu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e17d5a791397c322ca423cc473f99831/97091848852.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/10298078883.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92212b6d74---nolan.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/rajuwokimoxotoxulixop.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lafiwuwosivol.pdfIn PDF document text
    • https://norservis.info/files/files/84359287964.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/44791873285.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 10904 bytes
SHA-256: 6d9e53c0afcbb5d57ff4b6b37e550a70e4a31d60714a2f7843a90bd6efd3f308
font_01_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 14124 bytes
SHA-256: 3c1db7658945d46048e7f787278160651355c74aef91f4b9b815853bae807d07
font_02_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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