Malicious PDF — malware analysis report

Static analysis result for SHA-256 885f412b1523fbb4…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 03:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f260e83fe82397606ad46a1b4e442a07 SHA-1: 66d53a894608b3dd2a1290536d649059a303c775 SHA-256: 885f412b1523fbb407b3f2001af4b0c3adb152747bab8ddb44b93fdd5c6d755b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URLs confirm a pattern of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=registeel+alpha+sapphire PDF link annotation
    • http://cdn.eagle.mn/uploads/userfiles/files/2738920807.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nolafovitunokis.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161358f0e9fd01---xoxapove.pdfIn PDF document text
    • http://biomehl.com/images/content/files/powumokofus.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c28eae565---65475493530.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/23957992035.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/51147947640.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/38890987375.pdfIn PDF document text
    • http://kodemari.info/data/files/46511858856.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/18625389441.pdfIn PDF document text
    • https://tivicom.vn/upload/files/sevis.pdfIn PDF document text
    • http://vpsystem.com/files/fck/futiribafizepevixudat.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210918092302.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/suvuwasene.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109021051412204.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/27433704313.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/tezowemos.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/70018453554.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zezatipijelapisidiwa.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/62570625693.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/rakivo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161510d5581b8e---15709382461.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210910_4581B6A5CD97340B.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/56062552640.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_off0000b62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62C 19404 bytes
SHA-256: 700d49daacf3a721b5289fb25c94f4cf4cf7f0b3bf790937eb0d7279795259bd
font_01_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 10352 bytes
SHA-256: f0442cbfd975f1b929fca3db521a749e4955dfa89285eb66c0630947f0f68be9
font_02_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1