Malicious PDF — malware analysis report

Static analysis result for SHA-256 de342e103897b412…

MALICIOUS

PDF

88.4 KB Created: 2021-07-06 19:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a83d28405747e731c007b332fdd22c7 SHA-1: 4644c9d9942da05260a736792234919d08886cc9 SHA-256: de342e103897b4128f8100ad047d577e53b2c29ea37d4fd05642b86259e4d067
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself does not contain readable content, but the presence of these links indicates an attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://espacioschillout.es/images/admin/file/68932550419.pdf
    • http://rlangkhan.com/upload/userfiles/files/96596958424.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaac8157c5---turajepa.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/f009hd8uf2mj9790m1074bk8o3/tikowatogitexeme.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aed2000---jujifiwobefididexitevew.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbe093f90---876446528.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/826dfaf7c1ca63c63563f942a300c13e/wixufavasutarupufesixeno.pdf
    • http://quangcaosms.org/media/ftp/file/vagekogul.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/mopanopudowukilakatin.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079a619ba288---16894139496.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fae355bdc02b714b87a0f6c94a624f88/seranosa.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/81483190529.pdf
    • http://absolutelyneon.com/userfiles/file/83391120598.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc545ffcc---liwedosizes.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c487c66c43e---27111320002.pdf
    • http://bidmitt.com/img/files/file/wabokuxokiw.pdf
    • https://arredamentigiacobbe.it/file/momar.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a7f598a5---26550409694.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e841416253b1d3f4d599f1f49e366fe3/lutesu.pdf
    • http://asea-admin.com/_userfiles/file/20210522135153.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/k4ujepvo8de5ovcafgi1te2d86/ziguxirizosulosipijen.pdf
    • http://zabradli-znerezu.cz/userfiles/file/gukudob.pdf
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/69551064897.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=numerology+master+number+33
    • 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_off0000f7b4.bin
7e12c0d095cdd957ed3e2e65197f23535e0e686431010002d5d71cb4b084d5e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 10860 bytes
font_01_sfnt_off000110dd.bin
d8512243c97d7cec8e86e2cfe366ea52886d8e4c6160ff98bee74dd1e3e64afc
pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16764 bytes
font_02_sfnt_off00013c9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 16792 bytes