Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a6ef4826f89d56…

MALICIOUS

PDF

103.4 KB Created: 2021-05-21 18:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09dc00e2bac9e8744035b0e744af519 SHA-1: ff3145b1a121e20fb2ab67c70700df13c932e591 SHA-256: 12a6ef4826f89d56036b5583770c9427c7b5ade2aca8f41b4dc4c8ac7a4c007f
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs on compromised WordPress sites, which likely serve as redirects to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=star+wars+cat+names+reddit
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607347983ce52---jelizutamoliwejabapekude.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ef3e3a3234dddf85b1e1cf6ceb4b10e6/71141445912.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f19306830---rudagesepunirutidabezobu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098ea07e0ed4---68544208002.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/adcf590434d6e0a97dfdae9b3eb23460/nuvevavadajo.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa47fbb506---baruzafasogogeloda.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f3j62sstoba9nk477k1ls1qa8d/nogalifodijexiguzuf.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e820300a69dd640b28e68025a76e7e8/84241933994.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/515ef2d7bc3ee9b7a360dbf470eb2732/40670013438.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56156b3b5---69513633210.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a8205d08f7d78c8b13b759048e49a577/jovobezelili.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5ccpqbh42miqqvl1kg75mpl6up/tegatedopopekexepezifowo.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kmcqbht5e9t552t4qtn2jvek38/39850010584.pdf
    • http://a-kamen.com/userfiles/file/fufekikugatavevobib.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d4160f8---12901819028.pdf
    • https://batikatravels.com/userfiles/file/gixudipuluzefanofuvefalig.pdf
    • http://botosani.ro/img/uploads/file/xoxofosuvupox.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/96b0f9930973b2e66d9e908cc9016c0b/rubenamozibaro.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/cho4mpdp7t70caopitk5nvmmc8/rodawunizowafomenadujot.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/cprkvdqhmuo9pb99odr5ar7fdq/sisenijexopajivokedekuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012958.bin
930582db7f59155a3f9d8fce54e053fcc5c3ea7d51a11871770d27b24192d359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 5248 bytes
font_01_sfnt_off00013b23.bin
262c003336053d15fb1e91240345a7f476f6fc1757b5c5278c2885f1f9329467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 4936 bytes
font_02_sfnt_off00014cb1.bin
4e47e5750c5a88e4c053cff9b61b549c893256400326d1cbf496ed576501f5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB1 13724 bytes
font_03_sfnt_off00017930.bin
8ca6ceb3519146f5204fa318cadb789f62e1ef35f7af6092a83c3aa723a2a44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17930 16208 bytes

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