Malicious PDF — malware analysis report

Static analysis result for SHA-256 f592c9ff7462a417…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 20:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffbb42964cd81551ee752241f8c8a806 SHA-1: 03bf983008865cbf7c4cca4b42e92bceaccb9b91 SHA-256: f592c9ff7462a4176304ca8155f49cc878a6c3263e59caafea39def42126e23a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure and URL targets strongly indicate a phishing attack.

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 0 text block(s), carries a click-outward action, and is only 68 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://synerhu.ru/uplcv?utm_term=how+to+hide+app+lock+in+android PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f437c25f98---84055613055.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/94684691667.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/65010875739.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/81794007051.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/vetinumakutujeka.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/bodavevewur.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/tebami.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/bafukerojidulinej.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/74558167359.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/tefopuv.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/97784609548.pdfIn PDF document text
    • http://ruihuitax.com/files/file/divifirolusukig.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/leremimosokamaladiw.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/71242415538.pdfIn PDF document text
    • https://schmitz.cz/res/file/88474845042.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/75732534633.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/81vipgodqp20h1ofb50pcl65q0/vekirevizot.pdfIn PDF document text
    • http://jinyezi.cn/upload/wonim.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/53571675494.pdfIn PDF document text
    • https://asi-filter.pl/files/file/zoxiweridakiwomodonevizo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b3c56379c---70788968421.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614018bf7e969---6158776541.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091121111573499.pdfIn PDF document text
    • https://loctra.net/userfiles/file/39680020059.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_off0000b229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 10612 bytes
SHA-256: 409922ce260880e55964c015f4f49e7f6a64a8a45491aaef0e4b99dd7446b4a5
font_02_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 14096 bytes
SHA-256: 7c8841f6d5144f9dddc90af4ba96ce78ee9d1109cfafbf7a09bd575ca3b9a492

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