Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc122491a6a30022…

MALICIOUS

PDF

162.1 KB Created: 2021-07-27 20:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56efa1252d3732f6e0b70593b83d004b SHA-1: 1625f68f31ccac7f449506554f745a24e6ff8919 SHA-256: dc122491a6a30022801ec44f7277f90d9d0677a5551258115bfcf57947c3c1fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the FormCraft plugin for file uploads. This suggests a phishing or malicious redirection scheme, aiming to lure users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083278943a8e---besotutopitatizegub.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/39b9251ec4c0e811e66a8cf60936753c/wuvaraz.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b25b2f149---7249176648.pdf
    • http://handinks.com/ckfinder/images_store/files/54591833857.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d53e8280a3---47432268378.pdf
    • https://rkdestate.com/userfiles/file/86614858987.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a677e40ca---dugukajorabe.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34be20fe4---kokeboxiwozudulufaf.pdf
    • http://nhadep30giay.com/uploads/image/files/pobugemugetagoreki.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/13825972866.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f1f125c7---3792479184.pdf
    • http://win-sonic.com/ck_imgs/files/93342082991.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851b132b8a---80086743147.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0371829b7---karedixomip.pdf
    • http://houselandia.ru/files/13539734059.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742bb9d688---sesagarirexukadewekevi.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089b39106287---xajegaxemir.pdf
    • http://esoftland.com/userfiles/file/6652259628.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4227b843af---nivefelubutugus.pdf
    • https://tiguan-wiki.ru/file/vefijimitavemaraguliven.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bb169e31f429a7b1c90e36ccbe6e1917/xolufexusav.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3054efbec---valujupanozofusutugupuvus.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a6a6a505b56788082a4ba8b0d9777e0c/66212947977.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/384f60f85555dcbb536ea6e87df19052/nuzagiwegu.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7b0ca8165e2215b5d025905ccbc6a941/990930052.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=novela+dez+mandamentos+cap+20
    • 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_off00021056.bin
fa0210bdde308f5296380c90728abf84530711dd01885a6a1c75ad9b4404926a
pdf-font-stream PDF embedded font (sfnt) at offset 0x21056 10828 bytes
font_01_sfnt_off0002296a.bin
22482f7f41dc49d99288624b6533987021ab8eead680ff2f1f9934eb45392639
pdf-font-stream PDF embedded font (sfnt) at offset 0x2296A 22352 bytes
font_02_sfnt_off00026079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26079 16792 bytes