Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a72543f89b2b82a…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 20:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4a75636601e4399e3c5c20a16c99b94 SHA-1: d74797494844f25de7f38378af9bb525e06ca613 SHA-256: 8a72543f89b2b82a2baf1e17a5e6700a6e74a79064b0af7cf2416df35eca6305
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, suggesting it is used for phishing or to distribute further malware. The presence of multiple links to WordPress upload directories and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://chcial.ru/uplcv?utm_term=and+if+we+only+live+once+i+wanna+live+with+you+lyrics
    • https://heritagecambodiatravel.com/userfiles/file/tafukixeti.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/nfdbvebiafsrhtts6nq2citj25/93179475946.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f0cc11709d05e5637ebca1c20d567d15/gifidebojekerezugiritad.pdf
    • http://medica-eg.com/userfiles/file/26879034742.pdf
    • https://burstallconrad.com/editor_files/file/332410692.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/413ff4feea9f73851949278e6dcf0071/53849606797.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c21680c5b2b---gejitoni.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c6bd67a7---mamegeliximilusebipe.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab801ca49dc---23528187432.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/534io4flvdl0ac9l2bnk8bm2t0/kobiretuvenafapekuro.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef79814692---97337492666.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ad9672e202771684bcda4d99ab1894a5/13632371249.pdf
    • http://safeabortionnepal.com/userfiles/file/diputugabu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086de75afa55---gapakejapusi.pdf
    • https://chaplains-camps.org/upload_picture/file/56889998157.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b7186a39b31b4cf02a739ea297b8a7f8/wogufutab.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/kebonatavojudimowe.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608581a786e39---96265984653.pdf
    • http://bitite.lv/media/txt/122/file/goseronidowem.pdf
    • http://normel.org/files/upload/file/patonubatatavatewoj.pdf
    • http://guowangcable.com/d/files/telasupagabefakixu.pdf
    • http://kbchina.de/upload/tivadodadozexadiwotiwojav.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/909a40caa695a81d2e23cebc2e7434ec/39640046457.pdf
    • http://evpltravel.com/xv_image/file/gusix.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r1hpm8k6lkjhddj0igars1f9u1/51068773465.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/14684086764.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d76b94c9b9e59d5c55396a4cf601cc49/benomopivonujebidipozul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88a.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16160 bytes
font_01_sfnt_off0000edff.bin
61ef9bee5a2ced8f4fb547e4052babcfb3f9599dc14192e6380ca0151465f76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 15744 bytes
font_02_sfnt_off000116a9.bin
7ff28bbcf8269c31c4eca62dae62adb777ff340d8ea13df22b6284beeacf5fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A9 10920 bytes
font_03_sfnt_off00013001.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 16792 bytes

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