Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f84cf3680e0c7bf…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 13:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6eaab5e8a369d27d085cc7199de95885 SHA-1: d2d2bd6f4e8b9e5ea7f99b208507ddfdb63da52c SHA-256: 3f84cf3680e0c7bf815865b38f1912ea1fc799c226e9f11cf2652ba48d87f25d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing and malware distribution. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed payment instructions, a hallmark of business email compromise scams. While no scripts were directly extracted, the presence of numerous external links and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://sb-78.ru/files/file/nubodikuzejebo.pdf In PDF document text
    • http://thaiboxes.com/piceditor/file/sulevam.pdfIn PDF document text
    • http://rjt1.org/upload/files/22682234918.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5kkrrlmmqustklgk4dijvov6to/22679054856.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf15acd28a---bolulorareresuwujit.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ec0492cc104fd1a8f3ff784d7d102dd7/14848338130.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/rowuvakulavufofawazapi.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/52764267998.pdfIn PDF document text
    • http://bndweb.nl/upload/files/23233367422.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/47281129288.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/fokufigigupalukagunenaj.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/4630074841.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/munusokebefusaremotonemu.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/54078442518.pdfIn PDF document text
    • http://epicridesnepal.com/files/delakalux.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/talixeburonafuf.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/tatevud.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/16148202021.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/fozawaworibifiposajidum.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/guwipodemakalofasod.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/69742683537.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/pebapidimeseresepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+see+hidden+apps+in+nova+launcherPDF 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_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10852 bytes
SHA-256: 4f7547e660f98fa2086ea55dab4e246f5aeb3682d0caa89131734b8f9c2611d1
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 17792 bytes
SHA-256: 46d6765901e815c94b9e95bb4ec5953aaec747680d52ee0bb324d792f7493a98
font_02_sfnt_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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