Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93cbb731f1a2f4c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 03:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3f153f849f4462240418f2a4c3cc061 SHA-1: bdc58c2aef9e18cececc2efe296db59c74ae3629 SHA-256: a93cbb731f1a2f4c3a654654e4cef2d45ec95d2b3c4fd4f64da42fd9b97379bf
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, some of which are also PDF files. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3428dfa3d74f65517b94fbb99c3eae20/vasuxixedikadilo.pdf In PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/japokalusowav.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/33fb54cb3c16749aa005a7ad5c7c2cfe/rudulobekaridefosunaviro.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/73666438263.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac24827c9c---mibok.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/tavef.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/9693298927.pdfIn PDF document text
    • http://amandamaitland.com/images/file/45245983037.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2c0846f4049fa96e02b74d1ae1bf07bc/69246116666.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/kenaxujelu.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/tapewaguxutuwesomujejem.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nerejutowifidizosijul.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/868oqdou2q3lne3p7j4vmcc3hs/85163413372.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4c0f0deb---rebonomitum.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/rojirupapawabefarazu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160774be4e7abf---nugezumu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9f22580392999d54cad0d10d763ba404/xoponapiwerodedi.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/90967505699.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/17281850508.pdfIn PDF document text
    • http://indecomavo.pl/inc/26467372477.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/xubuz.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/86635566052.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/42115922604.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/rutepofalajasewomuj.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/pimesolulutodimejap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=history+of+computer+pdf+wikipediaPDF 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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 16964 bytes
SHA-256: 892d12e91dccbb41ab40f43831ea239db41ff515f5d2527b5b04b9a2c6ccc788
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 11012 bytes
SHA-256: 113015d3cd15e48e18494a9000beb2c038b563dc77b822aeb532bba7fd2f5166

Open this report in the interactive analyzer, or submit your own file for analysis.