Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04620e27e7efc9c…

MALICIOUS

PDF

83.8 KB Created: 2021-07-03 03:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b231656f4c2067eb4db4932c442cb56 SHA-1: 10a4225246834c1e4f96a6ff9a6b14f94911adf0 SHA-256: b04620e27e7efc9c3a60f715aa920382ce017cc9399d87a8e8987cfe0675de7b
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 and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://www.gesas.it/media/mailinglist/file/vagunijirilev.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cd692c45717---94439256788.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607332e94be8c---43939408798.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zasaxakudaxizib.pdf
    • http://sivam.pl/files/file/91906347841.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5221c773---37580620682.pdf
    • http://dalboncostruzioni.it/userfiles/files/gepimoziguperuwaz.pdf
    • http://belgium-ex.com/images/blog//file/69757684046.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609637c247a80---dewupiwalurojagevasotuw.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1a3359cca7b8a83d2a1c8f698dca2378/47144067569.pdf
    • https://xo-sound.ru/userfiles/file/30889703534.pdf
    • http://cy2hand.com/userfiles/fizixo.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/72126112731.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/babug67jl3t5od4brnp3jpmbf6/pefebatuwelazowopinorifo.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9376b71b3---tivutozoxure.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160790ad6e6ec7---95565510892.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835088c5771---56875266985.pdf
    • http://busankid.com/webfiles/board/file///ladifo.pdf
    • http://hydrogears.com/survey/userfiles/files/jefevapumoxivozeka.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/zitakos.pdf
    • http://martonelektro.hu/files/file/48025697103.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/balalovef.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e26115a195f893194153bfb7329a15dd/38411134749.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apa+7th+edition+bibliography+example
    • 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_off0000e050.bin
d29bbaa93aacbf877e1914965334fff75444855a2ec2e1a0e3c4cfe7b3af93a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 18176 bytes
font_01_sfnt_off0001108e.bin
67b0d1cc7de398716cd3b41ac11be3dd0d4f32376c961d8cb1e562ca924b17fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 11060 bytes
font_02_sfnt_off000129c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 16792 bytes