Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d69c006dab19f9…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 03:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008ff30e4c37dc92c9425dcb514f56f2 SHA-1: 548b13e79ab8df2a7826a180d3eb2c6e4e12ee27 SHA-256: 16d69c006dab19f9a9a6ce6b97a02e20bc85146f318dc565c4218fbad968f112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/mupojogedofamejukelomudar.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/zudajar.pdf
    • http://champaigncursillo.com/userfiles/file/47116216597.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091d61740def---68589241378.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b758215251115452b9874da6b2882046/59151338523.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945754996e9---66814837450.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/9671602411.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fa179304d2320be0880ba137fac4fbbb/90679782109.pdf
    • http://needychild.org/ckfinder/userfiles/files/77366683673.pdf
    • http://epoxidice.ro/mm/file/xikisavutatabibujineta.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/nekorokalosasuwilonibevak.pdf
    • https://actaviaserica.org/board/file/files/50384241975.pdf
    • http://magogaralbamoble.com/galeria/files/82568392783.pdf
    • http://akinmedical.com/uploads/file/6068088124.pdf
    • http://arunimaflavours.com/userfiles/file/mazitijevawakozibijigax.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc925e6710---weruze.pdf
    • http://mail-business.ru/uploads/file/49348237066.pdf
    • https://wcfkenzi.com/ckfinder/userfiles/files/wizagokekewunidowizinagit.pdf
    • http://nasledie-sluck.by/var/upload/file/15268771447.pdf
    • https://kisikana.hr/userfiles/file/54232660266.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fcrno8c2nv2bnmi7mgmbm95qu1/garegobagasajor.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c8f8dd0b0f72c3a8a056eddcd48e814e/95595088723.pdf
    • https://argekaucuk.com/nbg/upload/files/96742365383.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f8d50c9e---69356769722.pdf
    • http://alimentosldm.com/userfiles/file/50940860887.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/44af323be3b74ca2ebb6aa30de784cf6/56832473234.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=icse+2019+biology+question+paper+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_off0000c0c2.bin
17421a5b56e587a43f36fb16669255b1eab886e445fd6ae74476b7a85f689e95
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 16784 bytes
font_01_sfnt_off0000ec06.bin
1a1807d42cd42a40213941280233d08fb842a29c3f97769fd67d6d34955668b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 11708 bytes
font_02_sfnt_off0001077c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 16792 bytes