Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5baa02af6bef51…

MALICIOUS

PDF

93.0 KB Created: 2021-10-12 02:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 66f84590517f08de3f042aa578f85fec SHA-1: 393dd7426f4bcf1d85327f1988289a7373299fca SHA-256: 3a5baa02af6bef51cfb42cbfc1042c7a3f92f30593c6b765a1aadbc74521e302
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, which in turn host further PDF files. The primary URL `https://archism.ru/uplcv?utm_term=the+production+of+reality+pdf` suggests a SEO poisoning tactic to lure victims. The document body is heavily obfuscated and unreadable, indicating it is not intended for human consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://archism.ru/uplcv?utm_term=the+production+of+reality+pdf PDF link annotation
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161446f130f587---8777679119.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/loluxor.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/kebakawiniwexuxareroped.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/16310897364.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/on251tn3bem8rbtv5fvpapdq3l/lolixugosetutupite.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kavago.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/88603c3d383b512968ca5202f91678e1/godizenopovukijibofama.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/81815044068.pdfIn PDF document text
    • http://vhshf.de/File/vuverijovulixozitugofewe.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/79128834874.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/17652460073.pdfIn PDF document text
    • https://successalpha.team/upload/files/jaxabigonabif.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/64111502725.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/44665661344.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163397746923.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/8733001296.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/gupedepuxevanubiwewox.pdfIn PDF document text
    • http://space-edge.com/upload/files/73322790763.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/47529693607.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/80183636251.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/romopakiduv.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/bawunas.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152b3c35bb5c---80532996623.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/68657685998.pdfIn PDF document text
    • http://livestocktool.com/d/files/wusopoxixebovinadelixidip.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/mivuwog.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_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 19216 bytes
SHA-256: 6adc929ea0f9ebb6f82ab77adac77fa2ed7281e77123fe27107c29105a9e113b
font_01_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D82 10728 bytes
SHA-256: b45fe5514326598f8537b00e4720a55e27f9449a2b7bf6f56412d3cf13e13758