Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e3cc19626c499b…

MALICIOUS

PDF

97.2 KB Created: 2021-06-28 00:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46e8de56fd00461c05183fcf72eb3ced SHA-1: 05ff4ffd246c6ff86e11e8695faba5c2048f3ec1 SHA-256: 83e3cc19626c499b48a69a741b0dccc1cdf36e4d7d1dc57f64e128eb32599b1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, suggesting it's designed to distribute further malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to employment certificates, aligning with the 'SE_INVOICE_LURE' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef2db1f79---tolepujikunokarivazabeti.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30cce3a38---lotigirilelatoge.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85118908b---ferog.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/66380ead9d27d700db9a2081f36ccbbd/wulofomasorumanoxu.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7d6dd60d4eb6d50cd30554fdb72339aa/41180712388.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/e6315635e10dd757050cb6f234d51241/24125594369.pdf
    • https://hashtag.school/userfiles/file/46989886926.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/mobujaravobugi.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d17a858f8a969d9b6c25c3ad007f6e17/42581443944.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c39a836d---namofusimene.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607720da22385---75388453634.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dadb402f0---64716310801.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160807239438da---magigerelinebixifibe.pdf
    • https://seedomoretravel.com/files/files/37915946270.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9b9282f2---73686155745.pdf
    • http://101-games.ru/images/uploads/files/22446570121.pdf
    • http://angelescare.com/userfiles/file/kitoxexumex.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mp2bkc6efav5fdrcg4988h5vcs/muzipetevodemapa.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88ba51043---nuxumevobepunuxobija.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6d5c71736355e764fc3012969d64fb48/7088495124.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d003023bab0---funip.pdf
    • http://builderall.info/userfiles/file/42993697999.pdf
    • http://dobrasekacka.cz/userfiles/file/fajilazezarupuxedetap.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kpdvrob8so6vk034lmhacgvjr4/92144745824.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=certificate+of+employment+for+contractual+employee
    • 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_off00011878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 16792 bytes
font_01_sfnt_off0001308f.bin
e93a73726c636364d3274b879262cee198b6d76af96579a0844d3bf6d2c8ae37
pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 10716 bytes
font_02_sfnt_off00014933.bin
ae92a5a28b2b8db67b5e18c2a06bda9bd7b8c72066791bfaf5dcbd0f514d470f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14933 17764 bytes