Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5112f58c2991427…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 03:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23358ae7e333f8e696685f37628fcd9e SHA-1: d4e6f36dc8a128dfd741a51f6ebd460cebcedd4b SHA-256: f5112f58c2991427fe5f1d6ed86afd5a63aa5b1e7e6e7e770b12716eb0a4cbcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=the+time+machine+race+daily+crossword PDF link annotation
    • http://instandee.com/Images_upload/files/viwadolisugowuga.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xobekapakazuwigon.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5e7d0ddf---95541146885.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/69788590012.pdfIn PDF document text
    • http://lyshiying.com/d/files/duxadaxe.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a27a73d2530b3e76e133632952abef5b/32358305072.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e71df47450---22015897215.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/potulanive.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/79601618449.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/bogewidovazakotuvokavul.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/6677057219.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/xetigakosowurikejoditido.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf60d0b26---27123030033.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/76375258612.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0pem98f04sjdrgl7cr7civj1f3/53254307907.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///45811290258.pdfIn PDF document text
    • http://jucal.es/images/file/67899760503.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607509e3ccc2d---fowupimijalox.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/42982899400.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/mijejasipozuwemamifibel.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6184013a0dc369cabf893c950cae4272/gesixasujajowak.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_off0000c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 10800 bytes
SHA-256: b2c5cc757056f5c90688f542602498906fc5eca5367a61c61739b7ac27ba6866
font_02_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 17964 bytes
SHA-256: 9ab2251ca04bfeaa6c4047a52678e89f216ea299c77836b9ebab497e33ef6732

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