Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a553ec7b7ded07…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 15:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6275fa00adbbb65068a5ae08d1e660f2 SHA-1: a3a60f05889799baedaa091583fbfd83f4ef4f35 SHA-256: f4a553ec7b7ded07cc15f080d0897e34a5864e32869e8d6ce7ded2f3ac0dfc03
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://cructi.ru/uplcv?utm_term=emory+occupational+therapy PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bf6bd9ad654d29294075e013c024ab8f/35766286542.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/32892129875.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/niviw.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3cf0hnrqi5r6if81mftcak0g26/33174396332.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/fogawavomuz.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fab03baa5---56830250064.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ct1kndvt9e76efq14iklkhcs24/34094964879.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/51420126127.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/remipudapevu.pdfIn PDF document text
    • https://ahha.az/userfiles/file/68660246915.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/moxukozudowoxazosuxop.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dd0612d25df59d1e513965ef07fcfa7c/32388370131.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/32ffd02535b3377a59371ae9775c2f36/74115494511.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28dfc112c---48555400314.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wadufafopazetezokag.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wogirez.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wenokifejupefaselelu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608520e927705---xamudologatidedivusozi.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/268602377.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/966f234ffbc92ca20f48dee5f45f2ce8/47056127238.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e31bf38fd3---60762864179.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930ef97544e---96341960456.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/bawokaxif.pdfIn PDF document text
    • 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_off0000c1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 16612 bytes
SHA-256: 1512317ef14dd214540ec09dd2c61e577bed6b5e13ab27c0a60b5df378fd95a6
font_02_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10668 bytes
SHA-256: f4e1b318af965a6eb618fa09b64c59cb7465db856245f71fcc386342ec6634fa

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