Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98d50deaa7c033d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-01 01:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9adea715df80ef19b5d72a093bd06c4 SHA-1: 9110d6115ea2228146142ebbfc144964cb90604d SHA-256: c98d50deaa7c033ded8207b91f4bfd326b8513fb03abbb0b585b215de3752dca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The primary purpose appears to be redirecting users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://irlanc.ru/uplcv?utm_term=topics+for+physics+working+project+for+class+12+cbse PDF link annotation
    • https://yesilkoyluleriz.biz/resimler/files/bafogikut.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/fuweta.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/8428832398.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/95fcb47b2b685bb2bc208dc6be1e9b4c/18511933875.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/30hokubtnot1bs7j7236pvcki1/55505971694.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088992537c79---69286666290.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a5c2787de---radibavatebefibuvuna.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/92994173770.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5d52ddf43244ecc46a3664c6792116a5/22603623110.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210723_184939.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/jukewobe.pdfIn PDF document text
    • http://gptools.net/userfiles/file/46544403459.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/3mtj32bpom3so8po6281usjp5k/nusewunorudezikemunili.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8o4tejhhcs7qjq07lk0ifopmgf/lilezupazu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/72a5510971a677a2518f561339af583b/jinusepil.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/54087426296.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b030e516e81328df2e2fde5f4b92e301/74544902423.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/55208882369.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c1c118b297dfae98ca4d6550214ead8d/45584732974.pdfIn PDF document text
    • https://digireg.gr/upload/dazuwovulirij.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/781mrkpqn5rlkf27o9pd0cqpe4/danogujiwum.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/wadodidegajinizofixaj.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/bizaza.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/sazuzeliveroge.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ad5c7fdd6fed724f6a5fcb525bf717fc/61282246853.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/lizajaporibomeluviduga.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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 17100 bytes
SHA-256: eabb754bfc488720156de800d671ae0cf07b3546742ba9f026acd696ee2efbc7
font_01_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 11456 bytes
SHA-256: 4343865470036c6fa19382f09c26395b4767cfd77c84ab4e847870a2c14204bc