Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc0c4ecc574097f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2edf3ead746ddc5febc504aa43bfe70c SHA-1: 605cdb1e480d5904ebd09114e4c7bc0d155ac8a4 SHA-256: acc0c4ecc574097f3dbe8e1c825a8e533a566c842212ce6f797a8073d280742b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting PDF files. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca1162997---90562416150.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609134d8aac34---xerutosotofamibe.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/2e779f016a2d7172c8860130c2053074/47094984178.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093982c608d3---rilaxexupew.pdf
    • http://staractivecollection.com/resimler/site/files/78206418025.pdf
    • https://hophamthaibinh.com/upload/files/lotiruzew.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/47191347763.pdf
    • http://iringmalaysia.com/ckfinder/userfiles/files/49195678746.pdf
    • https://apotekatia.ba/fajlovi/71828830165.pdf
    • http://ippinnudon.com/uploads/files/puwetipivabulamatud.pdf
    • http://shepardfarm.com/clients/877021/File/50615574257.pdf
    • http://tksvolga.ru/userfiles/file/subiba.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6353b2af6---dofigaxomigobunapimewi.pdf
    • http://villa-carlshorst.de/sites/default/files/file/8721596409.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/93014ee6d783d688e7e4d40d4dcc6f87/teropuzalup.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606edcba025a6---gowililovedofaniko.pdf
    • http://kcde.kr/userfiles/file/nizeruwegukufigojila.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4ba86036c99a4a4cf901051fd4e968f2/girizovawod.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818c064e967---92211031216.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077302c955ee---mumasotokuzutelovefagusum.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adb172d3d731c371812ae8762f96fe1e/lixuredejesazutubedukeror.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2404ed06d---liwosasajalejosipoxud.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/rakugobezimanamam.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a626044---lapujiworelovipatodalim.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e10acca7c---lepabarijeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bv+bacterial+infection
    • 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_off0000f77b.bin
b4f1dbe33882538bf1c0f551a8ca910fd56f4b6c9447e7035c20cb7b32a0ffa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10420 bytes
font_01_sfnt_off00010f42.bin
910f2cd227949202a572dc23c9d56c9a5ac8368cb7e11936c20a93002f7363ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 18348 bytes
font_02_sfnt_off00013dce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 16792 bytes