Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa586321eb4bc138…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 17:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cb5db4e072a5bfd6803260e47224218 SHA-1: 9feaa3a6cb4b730df727947f7af7bbcd528de8ca SHA-256: aa586321eb4bc138725e716f0176ef730f8e94d26b1e171d528864f72e20624f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://philabc.ru/uplcv?utm_term=vishnu+sahasranamam+ms+subbulakshmi+lyrics+telugu PDF link annotation
    • http://domainecomps.com/documents/files/95315757588.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/togeritudadetitaze.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/em8ecfnv9bccli2kbhv9i1r4dg/47371259221.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/ninotaviles.pdfIn PDF document text
    • http://hijoin.hu/editor_up/vifama.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/filajepaxigipedavi.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/14934446423.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/70772859747.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/ridokixupabiluj.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317df9aeb83---74122443676.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/30608490393.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/menejafikaj.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/86195298747.pdfIn PDF document text
    • https://wmu24.ru/media/file/1302480574.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/63449336157.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/22899679981.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/38311bcadcb0660a411f1eedd2ef7191/nulepajason.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wunel.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/58972852248.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/40667858895.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/nawamojukidewesuk.pdfIn PDF document text
    • http://skncn.com/u/files/60915443714.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/fukowilikovudisimiresuwik.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lezigutimokogosap.pdfIn PDF document text
    • http://kasargod.net/uploads/file/pugazu.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///belukuvet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 19292 bytes
SHA-256: 20991bdbf5eaf752919a963358a82c0b3e8e64b8b7fd5ee92d0f4c77721f87e4
font_02_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_03_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 10972 bytes
SHA-256: 5b0aaddc8ff1343f52e217030481ef1fe307a77dd5b6fd7768038badffa84569