Malicious PDF — malware analysis report

Static analysis result for SHA-256 6816556272a946f9…

MALICIOUS

PDF

105.8 KB Created: 2021-07-16 21:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 205b71fb5591857d55e4a059e4ea34c5 SHA-1: 70a7c24dd4cc359312aa30dc50dace47cc58020a SHA-256: 6816556272a946f9509b926c327e9ea7a929d2c566e23d04f39e7ba9cc084c6a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary goal appears to be directing users to malicious external sites.

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://namlongprojects.com/images/uploads/files/82301777401.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/n5tbps1q2shikpm2hmq92ntr62/80962555718.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/28914063326.pdf
    • http://interno-kazan.ru/upload/files/suputerunusovinekifal.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jesanisugigujemokimo.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbea5d39ce6---wovapojebuw.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccaab29e93---bazodazaxotiviwotivuvol.pdf
    • http://ackerviewguesthouse.com/userfiles/file/70967887003.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/nunogofof.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf63ed6826e---vepofiza.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa80694aa---1057850861.pdf
    • http://rc-modeller.se/images/file///65956762775.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a898246220e---48863675046.pdf
    • http://megat.pl/uploaded/fck_files/file/guxenijilefa.pdf
    • https://szallas-karpatalja.net/upload/58820799122.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bb9a79471---tifurage.pdf
    • https://laetitiabernard.fr/images/file/pupimofutokekedoxesomiwon.pdf
    • https://landbondcorten.com/attachment/file/b5917512f6daee4e28b1360f1d4d192c.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2685a3959b---29965934145.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a62c7aba---dawudejobupudutakelobanel.pdf
    • https://aviseco.ro/userfiles/file/lexim.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/il4v4uae2mh1ibium1mtlfcnh5/xanaxomulodobaderufugaxa.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5275b29a---67116970598.pdf
    • http://africa-emergence2019.com/userfiles/file/norurelerodirewawe.pdf
    • https://autoskola-scp.com/files/82511978632.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=10th+class+english+grammar+active+and+passive+voice
    • 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_off00013935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 16792 bytes
font_01_sfnt_off0001514c.bin
3cf7a33b14bb8ef29593565ab60fa74ea656c6d69134b3262a23cdc982e962c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1514C 11104 bytes
font_02_sfnt_off00016ad1.bin
ad0d00b3833bc9ad96e2473821e412f3af5c1872ca2ecf242f35ed5b76932e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD1 17772 bytes