Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e9075a0fa68b9f…

MALICIOUS

PDF

90.8 KB Created: 2021-07-14 10:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cefad5d5e7ff47df38381ea209444d6 SHA-1: a5e2391585ebb711ac1d02166a4439899cfa02d2 SHA-256: 83e9075a0fa68b9fbc9ff02c724a9af320bdb542a83b5cb79b4c55ccda0e16d9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and potentially disposable domains. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=danebull+puppies+for+sale PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a188ebc0489efc76e27b9fbc7e400009/26240430599.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d107fe99041e0c957ac713b37e386638/34638402672.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/binokupusitalex.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b49a2735---tewiji.pdfPDF link annotation
    • https://247hvac.ca/fabulous1/uploads/files/vakidalebededixuvomubet.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/roburodawifudabotam.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210623003805.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c663ac42290---dekesin.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/firesajugudenebegexixebe.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/97340d831108f76d839b674acd481e53/93477184858.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8462217ed1---mudovakujex.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608697cb76cc6---zakagedifikewinowaxawa.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/lesax.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/84601555874.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rurojeba.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ttnbble7vr3ov4ao3bj04jom4/8744461660.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5e7868422dc6be3197b9ef47f4b093e2/9203647181.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be64d768ce9---19721733635.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/bevibibive.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/71545347546.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d82f06274cb---31730136151.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f44f4de770bc82dcd755588b5d90f2c2/98816512469.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/24455780858.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vodoge.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8934b1bdb0---98541111815.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_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 17436 bytes
SHA-256: 29ebd4f5de3ed7a0aa9c1107fbdcdda70ce008ffb12a2f6ee9255a25b52fe2bc
font_01_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14624 10492 bytes
SHA-256: c0fb5cd32332c4b34ca6905c156497196f3178e23e63924f8ee67fa4934b11fa