Malicious PDF — malware analysis report

Static analysis result for SHA-256 0853e68c9000c5ce…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 06:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5ffff126b75709c66ae4f99cda8daa7 SHA-1: 82b682bbed2e632a50e5409c4dc732958c4d4e2d SHA-256: 0853e68c9000c5ce51e6569b52d6f89361577accccd9032988b52e3fa11e94c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm. The links point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious workflow designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e02e94d9---wubewojeji.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/64016677982.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d79236eb2---xewisunutumivefim.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa044d2a68---40214277089.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7d39l5qafg9khqofrr361et6sh/wusadamajen.pdf
    • http://alumnicollegedelunion.org/clients/76066/File/41186838294.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/voramodimitesavewi.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/19863bfa9381fe69cc3f21f6d1604231/30045993299.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563c49d2f4---lizirawibewokinenaliteb.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/5da4f754f7b2b1dddd0695158f6beacb/36707885246.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba4a58ecf5573dd818d871ad8607b2cd/nodegarit.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/be9c6ca93c171da816912fdcc1454ff8/rabavoto.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad702f62437---29366651183.pdf
    • https://aawyx.com/sites/default/imageuser/file/subasaxalutarerurupot.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/dca6f4878ce141eff5c1588dec80bfa3/ratexapamexemujedatotimoz.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o6p64f53ckgf1s8n2k92drcsug/xujurera.pdf
    • https://airtelco.com/data/users/_/email/files/wezepobirisijot.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f5254c67981eed3e39c84ed231e67085/mawifuli.pdf
    • http://newo.ru/files/files/zavezekadit.pdf
    • https://bititechnika.com/uploads/file/21148005174.pdf
    • http://kashima.cc/userfiles/file/fasemalemanuxabewo.pdf
    • https://advantagelic.com/singhania/downloads/file/73493023522.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/1e7eb8f9422ea4dda9b29303f64fbb5b/lejibekaj.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4f977d81b5f5f9d2c691780e43affc9e/44500605690.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1l43eot097ldeajsmhevlur76/jedijewatofaru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+hunter+call+of+the+wild+skill+guide
    • 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_off0000ed74.bin
c9be79574dea22df1de9ae99d1ade766cf1c77695413cde0c4b7e7dc41efcca2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 17000 bytes
font_01_sfnt_off000119d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 16792 bytes
font_02_sfnt_off000131e7.bin
18906e90e520eccb4f54f5ab4d92c9bf462b759334cdf32c26d9220d59fdb9b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 10996 bytes