Malicious PDF — malware analysis report

Static analysis result for SHA-256 a743824191cfae3b…

MALICIOUS

PDF

88.0 KB Created: 2021-08-03 03:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de15b768b2be72e55e1c9e1c26452929 SHA-1: ab4401c17c054f7a300d9bd897a5549bf2183b4c SHA-256: a743824191cfae3b438d5a583c7e989b9da21ab085c6e971d0e3a17a2279caa4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/26b1501af71b287509dd3ae71823e3a4/girerofux.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/jarizuje.pdf
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/xilevavanerofefakawife.pdf
    • https://anmoul.com/userfiles/file/sasobavowosiwijalitepodek.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed9f6159d---71725218947.pdf
    • http://netinflux.net/userfiles/file/fixijomewirixuxorumit.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/66121605103.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/147000c06d8438d04ef7aa2c48c7bafb/16727577290.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacdee80b3---5034711481.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/nokimujabij.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/45749aefcd6e5d2ea941375ad5986c74/pufuvavoped.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bb1301056340fb38f3268f7ca561e951/40538525428.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b6ee92ff---vizonapelib.pdf
    • http://aps-mes.com/files/file/resodixuwofi.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d45a6903f50---kegadekomu.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/25595542660.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pfjg4qiq1ulf0cne2gfqhlqplt/2788352343.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b0bc7462a9a398a5467385f19238d75a/rixilafuruzekeri.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/91315390581.pdf
    • https://thefertilizergranulators.com/d/files/kowidofe.pdf
    • http://www.europesolidaire.eu/userfiles/files/20545005165.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c981c6238---31259275852.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/95967692666.pdf
    • http://toshiba-center.ru/uploads/files/43218422594.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bmtrg49h851mjqg0p1mg6javrl/nemagipevexozepig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=font+style+photoshop+cs3+free+download
    • 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_off0000f330.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
font_01_sfnt_off00010b42.bin
a5158fd1d4cc83d4c33b04eff0aa8fffc8de3b4a92c267ebfc4f2727e9acf6a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 17212 bytes
font_02_sfnt_off000137c9.bin
a8d5912e264789018138662132dab598c8e8134b7ec76e187bc3d390923dc722
pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 10972 bytes