Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ba99f7bc43ef07…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 18:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a056e5fca2b4913f8b60b2626e1a7b5e SHA-1: 9fece264651feda2af42715ec81dbf6427ea65f0 SHA-256: a2ba99f7bc43ef07633c0e9e8c65c2ea463d8b155087077120aa518d28dd7495
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://netshopnepal.com/userfiles/file/69565599221.pdf In PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/30291856896.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9ca881280---fuwolaruridiworezobidera.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc19791765---lepiwegefexujefutoluz.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/6f84c9081c848c837e6626b51542382d/47146871296.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/14335809835.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/6101701910.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/zasisadotebenuluto.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/getebifanarunid.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/24272071144.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/vujapokidotekotaloki.pdfIn PDF document text
    • http://m2m2design.com/userfiles/52164636144.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/18230272329.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731abc8fede---28153402448.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/koxopuwokuwatukuxabomotev.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/14828955.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887acc1c0f6---disiwosofiw.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/b6h8c2dem8j4q1eomrjiotk3rq/25863631537.pdfIn PDF document text
    • http://polipack.ru/content/file/56580701970.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb516cec23---2298796121.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609558a753d8f---wuzimovexegidozebapolun.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/jidojezidisipol.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/samegepuzasuzemu.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/41939183163.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/49475239201.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/karoxin.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/bolagoveragonaxosipamibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ielts+academic+writing+samples+pdfPDF 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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 17568 bytes
SHA-256: 491d9f999336793f05d825ba8704df3860d6f9189c896270903e1b2f6c9073f6
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 10880 bytes
SHA-256: 390c161dfe223b653cd3a235a138969d34a693321d73c601d914fd8ee1a465a8
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1