Malicious PDF — malware analysis report

Static analysis result for SHA-256 31724f00a67d91eb…

MALICIOUS

PDF

83.5 KB Created: 2021-07-07 23:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc27e52989138cf4eda3f2af91598d0d SHA-1: a6e4469ff49d1e5bad2e916e7c9a55f1b728b4d6 SHA-256: 31724f00a67d91ebb880212be1cc8dd64ef22c05a0b4cbd69fc1d7dce526ba49
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, indicating a phishing or trojan-like behavior. It functions as a link farm, presenting numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aftaplan.com/works/peepsparty/html/upload_files/file/fodozobinuwuzebirik.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ba851765ae6f484a472f24c9eea86fcf/70298583964.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a95e4b86---45818617353.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5634d7dbac---vugetekif.pdf
    • http://udmvdpo.ru/images/files/19037391255.pdf
    • https://digireg.org/upload/69163027455.pdf
    • http://studiogallerani.it/userfiles/files/nujenitesomesa.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/94d05740cfa2ebb89bb0d0b57004ea37/dudumunaniwuvuremiwuf.pdf
    • http://www.aqsclimited.com/EditorImages/file/20868645165.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/hqes9gobpol7r6dka35vg1vplk/wivovanajubotosarokafeluk.pdf
    • https://theelementrama9.com/userfiles/files/rigibuvikitideme.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/catsia2eme882cgivg48133or2/9923543114.pdf
    • https://chp-travel.ir/data/file/96894379603.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/51ef4029b418a23f28e9026d6cdd1e19/64692013897.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/0cshr7jghlfpi08n99f82im549/56554120325.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d68490e4---84135886984.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d251c5c9---99907012360.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ccc21662---86418244869.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0df26beb2---muxuduzekuzebenovukitalul.pdf
    • http://yaqeen-eg.com/userfiles/file/sufefabupexuzagoxumir.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082325893fd6---rijiweferogofunuge.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429174336125.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9504e52a9---95516612623.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756cb38ee65---62465415655.pdf
    • http://rcsiprojectracker.com/userfiles/files/tadozenitavodawut.pdf
    • http://fszhenjia.com/upfolder/e/files/20210607164658.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=richard+p+feynman+lectures+on+physics+pdf
    • 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_off0000e000.bin
da15b7151325213af449e8b9d83e6202d0486ad549cdbc57540e276edfdbb932
pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 17068 bytes
font_01_sfnt_off00010c99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 16792 bytes
font_02_sfnt_off000124b0.bin
a7d43245345babc5c7780871fddb3820b386d2fab4b10fd67906c09350b6698e
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 11144 bytes