Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dca1d08d8751fe6…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 09:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd000d451ae7c746171056d22648203c SHA-1: b9ea188b6d40778009a4cc485e48d5866fde9ee1 SHA-256: 7dca1d08d8751fe6fcd044d83d4497ad0cb5e3044c594f91dfe1dede8ec88315
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple URLs pointing to websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://bellina.pl/userfiles/file/36596763795.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1e25a3ef---19035530291.pdfIn PDF document text
    • http://premo.at/userfiles/file/49201307680.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/18122736942.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/fozivoregidapigul.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vean5sm02k77qo84bnm1v1c9em/23895169467.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2k6cppck3a6rtg64onm6r63135/fenafa.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/degigutuwekunosezup.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/82989648437.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/delipinikirijivitib.pdfIn PDF document text
    • http://allycatering.com/userfiles/lejobur.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32b39d254---xefipomisotilapafibuxev.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/kijesijutulazisu.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/nevad.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d189ba1a61---mufilinepakekuruzujix.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/fimesetiledoro.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/60254012557.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/tinobiwuvunumuxex.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/60864819799.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/fisipodixetof.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/98511834926.pdfIn PDF document text
    • http://dentali.cz/files/files/72843895052.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1ed6dad8ccf64fa9726d201629224e97/tamirawewowuzagopevibavek.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/ziketokininuzawotoxoj.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/51073610922.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/49549121076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sector+wise+stock+list+in+nse+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 10704 bytes
SHA-256: b52e8b061868c48315247fa6d2dc241898d3a57a74ac4f7ae03b88c5cfa7b934
font_01_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 20332 bytes
SHA-256: bcb09f72c07e6cdc1d3f92c07780dc379c880d073db1d026bc98d5d1b09e932a
font_02_sfnt_off00013d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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