Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb742c0d0090bc8c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 05:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7d2012d8582cf539b6b09c1f6af4d38 SHA-1: aa8819e6aec77b9ca1ea1be47f406e9bd697c0aa SHA-256: eb742c0d0090bc8c399794965abd74c566a4543d3ede104f0b8690ae93754ff8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://sanitaerprofi.ch/fckeditor/editor/images/file/54779212667.pdf In PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/falewawinupigekaxeke.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e29292a6d6---34196314865.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/20570608128.pdfIn PDF document text
    • http://rhondachem.com/d/files/96421336693.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ihvr4u1h3ef5uckbpvtc3gjsm6/mugididanaposojaminoneta.pdfIn PDF document text
    • http://alvitraders.com/files/wototubibabibitamelogale.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/mogivodoxajekigubaxajoj.pdfIn PDF document text
    • http://imotrading.com/images/userfiles/72645960504.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dizuvuxu.pdfIn PDF document text
    • https://apra.pl/files/file/82422510008.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/76833198757.pdfIn PDF document text
    • http://apvn.info/userfiles/file/maxekelelonuxom.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210925_050829.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/98587451869.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/gokisajutowexajopexexode.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/bavasopizepifefined.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/naxutosulofo.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/moreziti.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l236muqcphjoicca459st1ual6/duxonova.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9ec3d6a8d71242368c40fee001874359/pozugikejovapuvonap.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/nexarewa.pdfIn PDF document text
    • http://mylodge-naoshima.com/fizivijakinu.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/fodigogub.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/45652643766.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/mefoxosirawawobipat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=order+of+the+phoenix+audiobook+free+onlinePDF link annotation
    • 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_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 10884 bytes
SHA-256: f01215516e6cc98b0e8387d21bdfc92abb3ad4392a4f834f4cbd6546d223d084
font_01_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 15680 bytes
SHA-256: ded1ec34ccf0eb77b4c022c0d8c4f1f6bf4c8ba3aee0ed7f795b0c890c9ba6e4
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1