Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcc4bce21039a6e…

MALICIOUS

PDF

100.0 KB Created: 2021-07-01 10:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dad97f30018234fd460b60c01f7e1517 SHA-1: b42551a5d22fa85cbc4c99811d92572b287476b3 SHA-256: afcc4bce21039a6ef8046d8f6f9e4ce33dcc021b40ec2a9e598409e563427697
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/v4pl363f90a8ibsm1nnvh371d6/27327508861.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/918a27873b3251b5d07a6ca2b16eea9e/lowalavodawexajubetevof.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/jifepunabuxaf.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0a6c05058b183f2bcbeaf3b9efd55011/74333563756.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609326ccea08e---40657278742.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/lodinarin.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/52561754642.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd67aff24---jipitumusi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281b1a0605---26296873050.pdfIn PDF document text
    • https://waroproject.com/file/87510237471.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/81573598733.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tf0r9r4cutc3pgma089rqhq5k9/22200877666.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/munolipu.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/40045621369.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/32094648750.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/60de851a82a2953e12a4376b403a5410/xigefudiwibikimuso.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/5603527582.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607216ed68abd---66485507648.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a866ec7716c---96995800400.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/mson7jqni6v8pn4okeh1gm986t/xofogaduwijesujasox.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_055016.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3gdb9p6lr3bep3hvj8rn0q57p7/tuwurelixezepulufizix.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/nbkievdn4kvmul32ei2hq09ct9/ripenunolitafir.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7413ee5bf511fb37ac09068310c40a94/zudibupixukufew.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/89597235829.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876c4e9ae3a---56404206312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=clinical+methods+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_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 17256 bytes
SHA-256: b83df20241fe8139ff6a18a51213210140b204d470c74588889a5ee98043c4ab
font_01_sfnt_off000151ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EC 10816 bytes
SHA-256: a1d5afcd74518fa3aa804312ce8ca82f81c97cc2afcdbbdd229686d6fe21bb57
font_02_sfnt_off00016aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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