Malicious PDF — malware analysis report

Static analysis result for SHA-256 670dcb2cab3fbe3d…

MALICIOUS

PDF

87.1 KB Created: 2021-08-24 11:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f60ce8478c2da6b09967682118bad849 SHA-1: 2346bde2ae3509cd83aa7e3d368f6ae5ad6aa6d6 SHA-256: 670dcb2cab3fbe3da048ea82b74ebe8d1d65782c0cb35aebfe53b8d9a8c57517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://irlanc.ru/uplcv?utm_term=how+to+make+my+pdf+file+smaller+on+mac PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a8442849---nejimaloxegozujirike.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/tidebuf.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/gabimu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xalovetidag.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/gaxejebulowo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f52314fc---19349539204.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/95577621195.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vp1mpaoponqpkfetkcstulp84n/bekebedizarilifisiza.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/ronanuzemobave.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/86721989246.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/bokadoxezedezo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wugowise.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/5252184899.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/gosinaduridesodemaxafelok.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///90788345223.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fe16056ff---sisimiwepuwexotadalesum.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4d7a0ce9---51687681082.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/goxarifipate.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5db0928a438db7c7c0453e30390bb42b/14794663984.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e65d6236---peborobudek.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ece3e3971---xonozusumunupupibaz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17b0a5762---dafegikejamuv.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/41720549930.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/637523891.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/93320197130.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ac0de14539293374b916cd7105a7368d/66188104219.pdfIn PDF document text
    • 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_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 11064 bytes
SHA-256: 6befae2a8e056c5e18134bcae26c42f7aced7a7855553b28040417c893de3d02
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 17040 bytes
SHA-256: aba11277559fbc8075451e35750cf10971cd5103e21d7183ca31570f1cfd5450