Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac6415bf84baf2d…

MALICIOUS

PDF

69.7 KB Created: 2021-10-04 09:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73b3156c9220486487edd94c679be5e5 SHA-1: 8053b0c422b9e0c238241c3b6439bb4f1f0410fc SHA-256: 5ac6415bf84baf2d0fe179c4eeac5c64eec1f0a00e024e339d375a9ccb958929
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, several of which are hosted on disposable domains or compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/susalopavuxapolutujunof.pdf
    • http://techbico.vn/uploads/image/files/nokebapak.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wenewowoxatususejafefivap.pdf
    • http://casier-a-bouteilles.fr/file/91829151308.pdf
    • http://curvesncontours.com/userfiles/file/dijagofavefalazedurimabus.pdf
    • https://digireg.nz/upload/8929400173.pdf
    • https://inprovitbolivia.com/ckfinder/userfiles/files/wonekidosudugos.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de46f4cf7d---74740455249.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/49972529230.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2be633c9ea25412e9660821b5d89f175/rigafiwa.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/repixesekumudetomijix.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/paneporada.pdf
    • http://bdnchem.com/upload/files/kajurajusad.pdf
    • http://pnalog.ru/images/file/rarixidew.pdf
    • https://www.edm-medical.net/ckfinder/userfiles/files/47795915514.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16152fe5f6300f---16096231843.pdf
    • http://upsshop.ru/ckfinder/userfiles/files/gemamefivuvepoxebelena.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1b0d991b---ganetada.pdf
    • https://girl0229960192.com/upload/users/files/xatuvidaxeruneribuj.pdf
    • https://resttour.com/images/userfiles/files/21741838250.pdf
    • http://hanmih.com/userfiles/file/20211004070746.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/lerowumiwokilulax.pdf
    • http://sintellect.ru/Repository/file/11368135840.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/boxajodufoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rename+factor+levels+in+r
    • https://tes-sys.com/uploads/ckfinder/files/20210921/16322146183140.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b156.bin
350e3fac56722a2677f20baf0e1ab9aec79f4caed92c3ddfdf86e6f63a945280
pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 15372 bytes
font_01_sfnt_off0000d8b1.bin
27fe82a5b3c8924080df85dadd85423854460864b9846f92e4f462a3df8358bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10608 bytes
font_02_sfnt_off0000f0f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes