Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dec4c25101a3607…

MALICIOUS

PDF

95.1 KB Created: 2021-07-06 11:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0336bbcfec8ba607e04afb3dc1989649 SHA-1: a314c75a27822d79d3425c65090a5e3ab937cb2d SHA-256: 2dec4c25101a3607d8a5ce4322161f343e177cdf7234cdfae0c57833ffeab16c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41787dad0---tojukuvuzatodezov.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948f602c4cb---4587602526.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066ffb9386---66124446856.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb517bbcc8---30647713966.pdf
    • http://jrpst.pl/userfiles/file/sevevizikok.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ab79e4ce---wazisabaxenemakakuzem.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9cf28eb65---lisavujexeveraxus.pdf
    • http://prodottoitalia.eu/userfiles/files/wuwegupufazasewud.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/wopuzasajidijixav.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944cb2a0526---poxebozezivitutopipozo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d97e761d75f---gosifilad.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d5369d7a30883ad6f561813babc577b6/dalid.pdf
    • https://raiporjai.com/piceditor/file/17275143666.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4978c1a54c---6587355976.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3446e0060---devurugutadovaxoxe.pdf
    • http://casier-a-bouteilles.fr/file/xeravikajukifonuka.pdf
    • http://progfin.pl/userfiles/file/mevifabifadolukuxiso.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef65257509---bepiviselameduxipunoto.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/rovowesuneg.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202161025757002.pdf
    • http://adice-area.com/pictures/files/kenugifuvibigedowuziw.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/507448e4c32d160bf5ec43293b418914/ruvutoratizemaxupubi.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6ae36a4e218164a1dfdc819bbdd2d57d/redized.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/pql325b7nlem25qg6u32fcv7mb/zozofoso.pdf
    • http://ngocvietbungalow.com/upload/files/77240933317.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+middle+ages+for+kids
    • 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_off000111ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 16792 bytes
font_01_sfnt_off000129c3.bin
e8f04bc46ed77be16e43ea1a8b5aa1da8096f914e71e240966ea1a85d0d56813
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 10656 bytes
font_02_sfnt_off000141e9.bin
4ddc4e5c11aa788f6d7c832d947918466a8cff93be94357696d0c5327bece8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E9 17180 bytes