Malicious PDF — malware analysis report

Static analysis result for SHA-256 d338907021b448f4…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 16:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb2bdbc45c812b22d159171b39c5d93b SHA-1: 1354d9f7adb9b0006f1f77a45aedcf14b8efff9d SHA-256: d338907021b448f447e5f3cf9c574ea0df6cb61f1f0a60f66caf3fee21068acf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting domains, likely to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607376e704ba9---15539930962.pdf In PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/vukuwejubetawan.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/semazijozogedukujimabijip.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qaocsr2nfqsabcauujupgelhcm/ripopuxalapiludawugab.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/21767263982.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/83772643518.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68acab358f13f9a6c4df6c6d5765dfc1/wajilix.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/nasotivi.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/25578666150.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a716f20a---roxatuzurumopagonex.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ea382556aafc2bd249c1741483536226/50718749670.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bunotaledasadodowirusamij.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c38d3f479e0---62333055735.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/nolupasoruj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a52e12d04b0---dimemumugudonas.pdfIn PDF document text
    • http://stroi-sistema.ru/img/28182759244.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j3u9lrpqua0i9lu5a799g77gce/rotowelotanokomefeno.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ac8cbefa---vofopigixatanirofuman.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/firepazerawiwafe.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c434c047a9---36234361758.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/73742527609.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/77293965634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hemiplegia+rehabilitation+exercises+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 17832 bytes
SHA-256: 24ee741963bbbed474d3ae63d21998f6e62f1f9f0f08c17d1aa3771fbad602a4
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 18224 bytes
SHA-256: 3d8797936cff4a8fe0eb52adf777e4c513c81c1d2400563d918d1aab373ca527
font_03_sfnt_off0001335c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335C 11300 bytes
SHA-256: b7495bf9c497ba34cec7f03bffdbcba6c0c081c152179926d17b4e58b98ed176

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