Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a790987f37d0eee…

MALICIOUS

PDF

86.6 KB Created: 2021-09-04 17:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eecd4311e4ab1c454185624978e8cf9 SHA-1: e8b00146778fac70ef97140332463fbe87d96aa8 SHA-256: 3a790987f37d0eeef8bad4fa9e46fc4a97b9d235f75f9d8f5759bcff6ae4ce34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely 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 0.9974

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://garglob.ru/uplcv?utm_term=black%2Bdecker+to1313sbd+4-slice+toaster+oven+manual PDF link annotation
    • http://pastoret.it/userfiles/files/16496526934.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/luxup.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/62819706248.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/jiguzetowafamumoxen.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/6157044420.pdfIn PDF document text
    • http://birdwatching.sk/media/file/sojijitebemo.pdfIn PDF document text
    • http://indecomavo.pl/inc/92913865393.pdfIn PDF document text
    • http://clingac.es/d/files/23136559210.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9urf4c9v0igolmgiiil684hse4/xefatibojovoxet.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/goxake.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76a68dd72f---zosoxugibezixebanosixufin.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607902dd17a67---nexogifata.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4qe9dfnpj275avu6b2ih2743gs/kekimudezulajok.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/finunaxevuwuzor.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/babizokisuwev.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/343897924.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a6e61363---junofazi.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/junapirotusefoloxi.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/ludijovozuj.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/83786042425.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bbbc9ae3bd40a07447ec1e96b3625898/pubitolafopojenojexu.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ac94d45a297f9c1006ce5e52400a60a2/gapoforebasitow.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7957d82dd7---98136814321.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/gakowupurusuk.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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 11316 bytes
SHA-256: 9c030d0dc0990d7cf520a34d447a789e537d594226d4a4cc73b52614fc45c3a3
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 18048 bytes
SHA-256: 10997f737fea086a48132270a918f0add5be08551f2eb2576fd56b333a61c0c2
font_02_sfnt_off000133bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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