Malicious PDF — malware analysis report

Static analysis result for SHA-256 c626dd25f00ba99b…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 01:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae505258fa84765a5d4474427747908a SHA-1: 9d9dc0adafae84edf16554f0b4b434ac210893fc SHA-256: c626dd25f00ba99b259e96a9242c8ef6b3a660affa073677f211daa4bb4951d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The numerous embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dnepropress.net/files/file/foradejepedu.pdf In PDF document text
    • http://schokozentrale.de/idata/wukixamumapet.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16083554dbc7a8---zorojoxubuseda.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uh2dupnd8s8ab1m1vlt0fq15l3/nugafejowenuronaj.pdfIn PDF document text
    • http://indel.sk/userfiles/file/33779477747.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e538e62a91---56047444834.pdfIn PDF document text
    • http://schokozentrale.de/idata/runukekajanesimuxine.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/ninelowegekesipumakonosa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/17210934611.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zinavibunarowukofuwoki.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/xeridebigatiwebidagujuz.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160941f6e6e233---xejuxifiwidikodovivofana.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/elh6e7bih5ksod1l5afpn61l17/timofe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mkmkqn0rs53n1rik9r7a8oq4jm/foxejibarujekidivadod.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3cdb4889---42063263032.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e52c6a351f35a51eb9fef8659a06c911/59974109964.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/eaefd6d9c17c6da09a5cc1036d682c5b/wonumemaj.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/lurasulizejusajuk.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/29707207528.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced89b8530---33223512445.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858c67ea2a5---51034961786.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/72925666283.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/bsl6bnmgldbmolhc15ra8k1l7e/80298836416.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/69486593846.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0l5kks6j38ts7knm7k56diue62/dibepupamefanuwimewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=post+traumatic+stress+meaningPDF link annotation
    • 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_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10628 bytes
SHA-256: a6f100bdd9b299c268f7607ad4cac568ce731fc0e92bbf688f4dc0c6fdf2d860
font_01_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16972 bytes
SHA-256: 7296630571a6562982e923ab08fbfa04c36c2d63634af3a94cff4adc21ea8b1c
font_02_sfnt_off00014300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1