Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec35ba16a03e1a66…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 22:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55375d03df089464935b4f10d4ef1fca SHA-1: 087e68069cc3b7a2d08b49aa23b37fcdf14d3e70 SHA-256: ec35ba16a03e1a66e81c9d26b4cc3ca8154777f88687be294a604b5cf455bc2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b472daaa8---64129466340.pdf In PDF document text
    • http://daoltrading.com/userData/board/file/diterijoda.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1mtu4qocp1j5qkqcidu13a95ob/58019596464.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/80648988124.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/3309225724.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/wunujenol.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/10897111378.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bdohqv4js84qj6sfg3dpnuupd5/natofazelidovepenomokira.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5ecc025cbcbf4d5d6d364e34a9b262e8/59560877103.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/faohpioqunmaba36rqu05cl453/48490319576.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b26832e4b64---kigidepamasabaginev.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/6bad8944595681e212ca6667bbda6270/42101092268.pdfIn PDF document text
    • https://autopratichesas.it/file/31621114636.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/93859098299.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5c7ad225d3993d52a0dc4dbeaacbe64e/52566226359.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/1rciv7rg8ip050nhfrtjqn107v/dedufasejaxetojagemekize.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/27ea98bf84abc41d95855a41d7f351d4/ximuxudeligonixiwawova.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zelobusigadikomo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/46df5a14ce2327241295dae5a651d0fb/zulewasudo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/gulaf.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e235041c7b8ba08d44d5f2ff1b548705/jefuxow.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jasuvexo.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/29497457778.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e6c90ea9---judob.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/winopudipatobobatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pathfinder+pawns+bestiary+box+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 11040 bytes
SHA-256: 38dc0b3604888cf656e2d5ccf41a76dab055f96ec1788620a7fb52648e09f292
font_02_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 18188 bytes
SHA-256: 9ac784f20f79bfac73c7c22a2367ec4de3b5c2fd794ef71e12368bba4663ad75

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