Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b6d9953d31f856…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 18:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d3546d031669e257ec143b845ac23cd2 SHA-1: 8aa19ebaef3668d207f56dd58c50897279e04550 SHA-256: 46b6d9953d31f8566d2f024f8341b9e114c3689167fa0814cfa96c3144b10a82
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs, including one hosted on a compromised CMS upload, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/sotuwirodoxuvewizuviwo.pdf In PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_944DB05B57E20B13.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/bomifojibujunabaxika.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/lakelog.pdfIn PDF document text
    • http://mextro.de/upload/files/2600948749.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/68830424017.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494f5a686a3---filefapetezud.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/96165670265.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/44747954060.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0ht3gtpem1ui4lm6f7vtj6f124/73009629414.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/zanamulok.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/54335912736.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/61486477822.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/49765444505.pdfIn PDF document text
    • https://unaizahic.com/Files/files/57654010744.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/bebovinij.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/mobolodegu.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/tedorumiganikozelediz.pdfIn PDF document text
    • https://beaszemin.com/files/86296958814.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dd5adb656323109a8ae4301ae26625d5/75977429742.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c69ed798---pevovokigen.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/97135220945.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/23a4795b6f7f2f4c25d00227f47b6dea/72505476359.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/78073965062.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/62275265601.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/ximike.pdfIn PDF document text
    • http://araratmebel.ru/img/file/60910118586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+grapes+of+wrath+free+pdfPDF 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_off0000b2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C1 15036 bytes
SHA-256: d9d7873396aa6296ea4c94b83cad8dd739833b8e92b9bffe5ecd8407324bb5e1
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 10584 bytes
SHA-256: d345f2df816ac2d943a5a2bfdb2aead7a3e805a2060b70791ac2ea3a24ec3db1

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