Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf41252aa3b96108…

MALICIOUS

PDF

93.0 KB Created: 2021-07-05 18:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1444e51cdd32a17af4907e455ea3fb9e SHA-1: 838e60c775ec0436719a7ebf2ed7265b97a6188f SHA-256: bf41252aa3b961089b0c6a7689829c11ad987e617455c80387e502f91ec0fdaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's purpose is to lure users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lakehighlandsrw.org/clients/863582/File/40878659405.pdf
    • http://igigeothermal.jp/userfiles/file/99327735908.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/uj03t0ut7ahd7d8vs60kma4q6t/mogezegefojififikimek.pdf
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/pepugevefo.pdf
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210702_CE350EBBC3816755.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddc426c6d---jukemajavezuzunuxijab.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/m5vnmfqlip1i60mhjj8jj18qsh/nezavosetokixim.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e1e08849---lekerubet.pdf
    • https://bdsvieclam.com/upload/files/87648972160.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/gf96hd75sdhuf05i3gr8kg7sj0/52419669702.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d02021744---52820714151.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160769889d662a---budazumiwovojuworojosep.pdf
    • https://sport-jicin.cz/dokumenty/16074784439.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/820da3f02341559f05112df90fc78622/jufamelamodipiv.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6693c8f3cf---nuwuvut.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3c61e57675f8aa9fcba9ea3b2b6761ef/45605767566.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac760a1eb48---gurelubaf.pdf
    • https://canionglobal.com/FCKeditor/file/faror.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4015bdcb9c---borefebusekerusepazemu.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f1ca951c5077a17b7450f0cc12ff05e7/nilorama.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/judopabimi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdfba2f39---88276011428.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rcptjh35iojl85frdiuosdrmd3/57024725986.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+compound+obtained+by+heating+salicylic+acid+with+phenol+in+the+presence+of+phosphorus+oxychloride+is
    • 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_off00010457.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
font_01_sfnt_off00011c6e.bin
078e8346306a915a67e9ce3d79b5a23642c1fb3a05299232c0a6a06b8e7c5cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 11572 bytes
font_02_sfnt_off00013755.bin
305c14e4d3760cf0eb27cb16c4a0300cb825ea12be53a314abc92cabc78d5a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 16780 bytes