Malicious PDF — malware analysis report

Static analysis result for SHA-256 a713b94753a06619…

MALICIOUS

PDF

90.3 KB Created: 2021-07-06 00:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24fce65be2b23ac04f4c0fea0ba42510 SHA-1: dbdb1f05b9912e897035bae68e8a258cfb449d0b SHA-256: a713b94753a06619ff0c0c73e94a7dfa7143c18a1d093667b78f19618a73e79e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised websites or potentially malicious content. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gerd-pollak.de/userfiles/file/niwizesukijijamedatelapi.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bi1grc0h1kae1cmljicahpd0cs/20810826457.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/korojenekamuse.pdf
    • https://alutat.com/data/file/dujuriko.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975023e6a9---rukesudelibanesuduwutater.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/wafukitawopu.pdf
    • http://planetamama.ru/files/file/49334697619.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/blkp3bvnucv3l5b9jsgoifq6g3/rejozoxitiwajarap.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g31dfccan02qilojh7jp449lga/nabeluwotino.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a5946f30dea---65827993275.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5699d99835---9259223869.pdf
    • https://starbox.fr/img/files/tovovunawafigasufazinovu.pdf
    • https://afayl.com/userfiles/file/74456814657.pdf
    • http://dispensapertutti.com/userfiles/files/pipoboxaxulog.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1907584d40226a0471f3a539fbf44890/xupekigo.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6f43bd473c6319c88a504c3f61c1cc0b/kiruzadaninuxezo.pdf
    • http://mdsalon.ru/img/lib/file/55449180651.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/mk4fv2nad8818aodk3cduk48u5/47956221000.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c84bee062---25398225065.pdf
    • http://cablexconsulting.com/Upload/file/19851612155.pdf
    • https://la-klamm.org/userfiles/file/77726582671.pdf
    • http://kapelski.pl/userfiles/file/55749340590.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8pbithfjpincol7pq1bhv4j4tf/47177206417.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ke6lr7l8cq3nqa9so4l34nig5r/tibisetodemivuke.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/rifidivuzataxo.pdf
    • http://cipetbhopal.com/webimg/files/wijulalofosipigu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a284b565342---95776923205.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=baby+day+out+full+movie+in+punjabi+dubbed+hd+download
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/da97939775dd79ccb31b4024311a37e5/69272621238.pdf
    • 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_off0000fb42.bin
ddaf7c1f4d03bec079a4ca498f8d870553a10c5f6ef65cdd00b50114fa99fe7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 11184 bytes
font_01_sfnt_off00011508.bin
002e09170a96500b07bc6a54e71aeaf962b1fd0569e006243ca228501146ef08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 17496 bytes
font_02_sfnt_off000142ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142EC 16792 bytes

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