Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d336fe01b70d02…

MALICIOUS

PDF

83.7 KB Created: 2021-08-13 22:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80cc8684c098d783162cf6020a6d5226 SHA-1: 49a70fdcfaeb029c17e849f30551b65d8e164d78 SHA-256: 49d336fe01b70d022541fbfaef689ffef68ecaa1a4db53a8a4ff8a9ac6c4ff9b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading further malicious content or visiting phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is not typical for legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa327e3714c---27559744338.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8250990a5a81fa573e68b43142e3a10d/nuvinipurito.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d7bb64a4---30104588034.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/54729720175.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/deb63854fb83751c1b58bbcae52829df/7923392135.pdf
    • http://irths.com/upload_files/files/birarewakewasopoko.pdf
    • http://suachuaspa.com/upload/images-content/files/nexifubigafimegavof.pdf
    • http://caopump.com/admin/userfiles/file/29140008176.pdf
    • https://chpcentre.com/files/file/3781086436.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dd7deacc---lizetekakoponirevagug.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7abc5241---zodejalo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u6c8eujlnf1o9akg13bjjla1ht/tozurujudavedazab.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/29cf1544968976abb32c87f04be6c366/xabubikajuvaroji.pdf
    • http://chizclean.ru/files/fck/file/wumagigezaluzedi.pdf
    • http://lab4050.com/upload/editor/file/rejivuguzokinoj.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaa1d79b3b---78101703951.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2ae9615ed6d9c6d231f1a7887b5ee1c6/raxed.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/nogedisilononozegas.pdf
    • https://mmagame.com/userfiles/file/44517508926.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49176a787e743e50aa6aae83008dbfd3/mokewimojorikotope.pdf
    • http://studiodrago.eu/userfiles/files/76682318040.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/82903540344.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfee3912e2---74616940422.pdf
    • http://tutek.eu/userfiles/file/sivefedakenemud.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f747d9cad---semudasaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+film+love+rosie+sub+indo+720p
    • 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_off0000e0b8.bin
4ea8d0c789eccae432bae054d05aa787f4fc5906da9b064bfb67aa2c61449598
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 17544 bytes
font_01_sfnt_off00010e8c.bin
fa97cee7ee291f0a5e2c9a0d101773bd6a8cf0876152b66965dbd4a6c8739499
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 11248 bytes
font_02_sfnt_off000128c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 16792 bytes