Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62b5328d8f06393…

MALICIOUS

PDF

89.9 KB Created: 2021-07-22 23:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8103274630ec41976c4bcab30866445a SHA-1: e5d83d5d42a05ca93c0e8ee2de25e659a40378b8 SHA-256: f62b5328d8f06393c6c7ab1771c5c80f1f966fc7f42f5c1d18ab8f3df8c76444
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 WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3b231cf59af249529bd9f1002d00f0c7/nevimologapifevalago.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/43838029411.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6be7de79c5da91504a51333c9d3166ea/45081977481.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a404fc416f4---34319139306.pdf
    • https://llsindia.in/FCKeditor/file/pidiwetap.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9222284a---86679267105.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/rilifusoj.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828acf21412---kefiralarosotanu.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2f378dbb---gumixasag.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0af442fdcccb6cdb2b6467085ee42dc0/vukatetuwumu.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/10c4b263d870bcc5f3022c19ab32db8a/safuvokuwikeso.pdf
    • https://dineflon.com//files/92019213576.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc850ff3a---94013901673.pdf
    • http://seibyou-koujien.com/files/files/vomimororijarinotavore.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/424baa2bd287835045cdd8364cbb1325/81439620014.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8447ddaa---45820395311.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5b937b7197dad25052a0373ba9548d7e/jokawudowot.pdf
    • https://schmitz.cz/res/file/soxodisudejufibo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f94a4909d400d6d9da6626194289717c/kumeximez.pdf
    • http://uforoi.com/app/webroot/uploads/files/53804685945.pdf
    • https://quatcongnghieput.com/uploads/files/24757077510.pdf
    • http://mamnonlittlesun.com/upload/files/36071352444.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ec3c56ed---ledomupukejesagazuxupu.pdf
    • http://sooclose.eu/upload/File/wofabawudiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=conditioning+for+strength+athletes
    • 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_off0000fc5a.bin
b12a469a1933ae881b7a64e94363f27f6c9fd0123d211fbbf9bfe72339fbab28
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 10664 bytes
font_01_sfnt_off00011484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 16792 bytes
font_02_sfnt_off00012c96.bin
e1c557cf9448da50834dbba4950b0e56b74c45b082b64aff3d6951d90a10ba3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 16896 bytes