Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec6733973077fca…

MALICIOUS

PDF

84.8 KB Created: 2021-07-08 07:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7274315393517836944e58a6443e47b9 SHA-1: 395cf7573f45b98cd2512104b058e516c3878d38 SHA-256: eec6733973077fcae29c565d75f8d5afca11de301ad650adc870d8edac55631c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beepost.vn/upload/userfiles/files/vavofobulobovewime.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8681396171---59054658635.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa82ce713---pesaxirofudebuxetak.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0b5b723f7179a3f50f03fd906dbc3073/selibi.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/69919f6d05c68c4805aa97343305b000/55778279266.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/492b09690efb6a5eb120c7f5eca7bbed/53710425879.pdf
    • https://autopratichesas.it/file/44013685552.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f661bb4acf926b607b98e673ab0d65be/tokudurasunezigipiwat.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1405bf398e970c5ef84a8787700cfea2/fekoraxofalazerot.pdf
    • https://thefertilizergranulator.com/d/files/ladilutadusirorixomod.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f652389f128c72da807fea5d1fef25a2/5859257493.pdf
    • http://bungefamily.com/clients/5233/File/18214967701.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5fd2d277---4642426845.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1030cc329381352e706bd7d388f2aba8/lojebedutowukiwudosesav.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/93906019086.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/df02818f9bd0fc437572de6999d4cb8a/fudutiremaxodameze.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0fc863b8---voxiji.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607594a10a0d8---kilagufom.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e98d4cedebd42caf01129b6d8f6c0438/28108918075.pdf
    • https://kawanmto.net/contents//files/pudedusume.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7311eb936---zazuwune.pdf
    • http://hzjksj.com/images/upload/File/17220448504.pdf
    • http://animalscipublisher.com/files/upfiles/file/keziku.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1dkd1viooaf94bgrpm3o5obuot/69104424059.pdf
    • http://terredellamagnagrecia.com/userfiles/files/jikuwivuzowidugi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+enthalpy+change
    • 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_off0000e754.bin
c499e9d8226df972f5317f3b1b7b70739defaf248d2303abd15193aacd5b7a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 17656 bytes
font_01_sfnt_off00011631.bin
7f6c87f268407f32c7c1211bdfdf98f2713d8fecc6598b346851011e2db3e82d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 10484 bytes
font_02_sfnt_off00012e08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16792 bytes