Malicious PDF — malware analysis report

Static analysis result for SHA-256 444e4ea887c17894…

MALICIOUS

PDF

93.2 KB Created: 2021-06-25 22:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45c9cb5059c26792370b68e5bb92137d SHA-1: cc88ab48e2b2b26304ab98104f106f5d5ca0e3ab SHA-256: 444e4ea887c1789456b3424dd07ad2a3eca0883fb173c91d9da61ebeb09a9956
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://myjobcareer.net/userfiles/file/2021061822034173499.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c786959cbf---5511598736.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c8e35a6ab0424eb761558404f878385c/8022067007.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ts6ecus56k623epof5n02peb3v/sipegaxotadilu.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/73934047660a0b2b64ec4a.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9ee3574e9501ae52b9c28177ba12d52c/jijufuka.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g80vusko5sm2sg36b0bhqnfbi1/raxusexowapinusijezo.pdf
    • http://lhsclassof1971.com/clients/74120/File/3021126733.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/29d46a6b05758a6f31498557bf67c8dc/9855423625.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2b951e0f---kifulamodavofilolaripebi.pdf
    • http://vejwun.cz/images/44888541539.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c4bb510aadf0a1c2f012b04727a21572/12227236351.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982a9163d16---87015634346.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c39c67d0e8f---menosutiwojojixuwipi.pdf
    • http://timandlor.com/userfiles/file/82110550938.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8648cf278f---wimixon.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1b4821e98421847b155a77de6425948c/badazabazilisadi.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c388f9bdd7---kadulifomaku.pdf
    • http://elsekmont.eu/userfiles/file/52019312931.pdf
    • http://millecolori.it/images/file/sitebokapupulakodideji.pdf
    • http://macabrey-luthier.fr/data/Files/jofetado.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/fdf2ela4hll92v8jju0prgqbeu/53848343208.pdf
    • https://childconcern.in/trila/userfiles/file/pevidafab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=estimate+my+refund+for+2020
    • 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_off000106f2.bin
c99e77f5f3ee1c88dfa3bc0f4888a21daf263e8b3f940fd027820feee2941b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 10908 bytes
font_01_sfnt_off00012044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 16792 bytes
font_02_sfnt_off00013856.bin
79fb6fbb7e5ef59c3a7aa4610be2ea984e77a8f41816787b716794a244557b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x13856 17996 bytes