Malicious PDF — malware analysis report

Static analysis result for SHA-256 b001635f71d7093a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 18:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95b12f39fd86c2394a6ccf85a3640efc SHA-1: 2c9b2854f9711fc4dbbbe6da1fecf7d1dfe29baf SHA-256: b001635f71d7093a39f612bb7a0e8a08ea8ba28503964737dda76d84c8429078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=alcoholismo+en+jovenes+de+15+a+18+a%C3%B1os+pdf PDF link annotation
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/fejajuxok.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/famavarojibajopopemomama.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/50307944296.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/21267125199.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812ddfe45e7---vavukorolaviwiwifuramuzow.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xenejaxu.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/18188818248.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dabunolunuroxuxepisivipa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/20faa133397a8033877845c5d5df623e/sugajevipetelujokubumufur.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1059893b60---kopikenawumuzepokizazekif.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f8031b4d---zuzitiminesu.pdfIn PDF document text
    • http://paliukenas.lt/i/File/47778799416.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210825_90BF453E027955F5.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dimuzamewijaloxajuwa.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/wunetodozapizitemiw.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16120698eaa4e8---78727417861.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/31605347796.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e952c2d030e732a6e9023a2dfbddf815/74353979404.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/41de6e6138fb2d84721229e58ed29dac/7698812065.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d5da2ee7fc6aedb6e5ca5d308f6ef9c1/47227151081.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/41895426125.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/39446911647.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d780d38e3e---12104387992.pdfIn PDF document text
    • https://thehouseproduction.net/file/wirufagasokepobukutifomit.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_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 18412 bytes
SHA-256: 27ab79fd31e9080506d1612bd780636b9e6f45dbb60d28e82daefe31f8360728
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 11464 bytes
SHA-256: 12561671b99ace41b10e06453158f00d4d4451707b5e97dc99f8201faf3cd3cf

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