Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43d3a12460271c0…

MALICIOUS

PDF

101.5 KB Created: 2021-06-26 15:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b361e0546b0d9ac46d5bd7d03d1e584 SHA-1: 0a608a1c4c0f6e5b4352b530a0a2508dfd35f1fe SHA-256: a43d3a12460271c0c938e1b7443e40af17fb7c9acc6a9d7797da709e3acf5632
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to the download and execution of further malicious payloads, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6d79f4d6---24559142716.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e0859f84---12883246120.pdf
    • http://absolutelyneon.com/userfiles/file/15433727588.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e233663ce---sudibolufadugig.pdf
    • http://botosani.ro/img/uploads/file/gaxogotodalekujofoxulideg.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2cb51dc6274c6020e5646e1366b0e487/sowelopoxa.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/676e216250f604e5686179e67c8ff641/40441992045.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160711646be616---42626610432.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e44b24e406---89274884700.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e1342b79---jufojilavexufomopiwu.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750afbb3143---roduvevejaxob.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe751bf757---novaxabed.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f27bcb5ce75689ca63f0a8e7fb96d608/10341143555.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ec4eaaac---22709845295.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9b325acd---4437982615.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160717a1049dce---bumoloveburijax.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a4591ac2a573da9fcd1f5c20ae8bc7b6/dovojavajikolojupujopaja.pdf
    • http://hiddenroots.org/clients/19739/File/fidefutonari.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6864f702da---55705734739.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31548e9832---dukab.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b256006a---86575339724.pdf
    • http://szzxwx.com/Upload/Upload/file/20216142052557436.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e24501432db405a3756950278238cafb/38859412648.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ff9bd70461fb3f5a5831534a7a870882/58576934258.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=core+ds+rom
    • 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_off00012d67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 16792 bytes
font_01_sfnt_off00014579.bin
30bf99f70cfd2e58be036fd4b49d9b99718686f675b6cd1abdeebbc6d986c160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14579 17412 bytes
font_02_sfnt_off00017321.bin
a6681a73d2bceb3355c2f3ca144f71a83e207f157011f2bada6d7a43ca41767d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17321 9936 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.