Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf3c1ff0d63a5b9…

MALICIOUS

PDF

93.3 KB Created: 2021-07-14 00:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b239007ed10a821f1ed108bc269c1bf SHA-1: 55d69ec28b98eb0116bdddc1f59febf7d263a565 SHA-256: fdf3c1ff0d63a5b9493ed8b44b67c1c896db9dbb9214388da0bc2cc752671928
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=find+perimeter+and+area+of+polygon
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3b214d3b---41250242544.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bacd9bed---bajakawulor.pdf
    • https://steklo-shik.ru/userfiles/file/49921456316.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607428aba289c---pakigumorawimuwipabub.pdf
    • https://aartipalette.com/userfiles/file/fonujarudexujuma.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ee9cd67a0---binizelutomon.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839228fc2f---40213939099.pdf
    • http://aklond.com/UploadFilesfile///2021062101512519.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4a23a47c---9917354473.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a99bd49d0---masawuteb.pdf
    • http://hongshengfish.com/uploadfiles/20210624/210624215548767025l0bp6dyo5ym0.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9b22a067---juxigigapa.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609183bcdfd47---pujutin.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/zanenibema.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a685eaecd2b---88431221661.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be827556aaf---sekuvesipewez.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/t2joqaqsu7e8bsu8ao79d4oc77/garonewepagoxo.pdf
    • https://synodradomski.pl/userfiles/file/59829666860.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc8616f00---17240645501.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4neu3ci5h2l1a162k10id6fdv4/55881278148.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/blockcv2b2mf3le52biih6amo1/mupofobesufidilowub.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/57971021733.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5a87639d698b10e91216c69c2225db1b/75471577310.pdf
    • http://funperm.ru/content/file/tamatovalusa.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b42097bae5---nirurusuju.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0a4f52c0a384b29f4012a137bf843588/fibetow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c2.bin
a92d5ab61e6fdbb4c0b4572c444fd01dc3c1ec5b69dbe7c31cb7bb718d60edb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 17828 bytes
font_01_sfnt_off000136fd.bin
8be1f6e8e9d4a49715d0a48450458a83e23848aa3fcbda997967decf6d184146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 10764 bytes
font_02_sfnt_off00014f7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7D 16792 bytes

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