Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e11e0c9ee38371…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 01:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0e2395b4cf3b2ff670981642a04edec SHA-1: fe48359e37a24e2992cbe040a78f0ab153fe3e0b SHA-256: f0e11e0c9ee3837128b013928237c43eaf1850a9a0a6570e05a40adb8f0f14c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links to external sites. Heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=android+studio+for+pc+free+download PDF link annotation
    • http://dokumsuzgec.com/userfiles/files/89887401995.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/64681814167.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/legan.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/wukowebinidamixozudozajas.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/28950325165.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/88523847830.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/mukovemal.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/vemerid.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/52301052152.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b28413efd6---watawutixo.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/93859893424.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/1034565070.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/wodorimomolevenorafij.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wemubirala.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210924_025250.pdfIn PDF document text
    • https://mattress-leader.com/media/biwanepesigimoxutodu.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/54305677751.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/zafefuboruroxewefup.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613310481ca63---52695491939.pdfIn PDF document text
    • http://amdind.com/userfiles/file/60933675797.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/ludewepodowobatos.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/febewasav.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a5732258224cb984fdb85666a564327c/kupobozizizadebaralefan.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/9555914721.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/turidefabegalev.pdfIn PDF document text
    • 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_off0000b417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB417 10780 bytes
SHA-256: 24eeb7acfcd9c6162db74aa001f1519ca0d14b104842b6b5853a658fb6373e9a
font_01_sfnt_off0000cd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 14412 bytes
SHA-256: b37c450e9eb32b9d1b2f20f1cfc5ec24dcf91125b58453667cfba5fa9475af27
font_02_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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