Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a6ab23c7b727d8…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 04:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e3a217a528ab14b111b68d73e650bdf SHA-1: 2b8431fa34346ad1717d31ac6ed23ae27f24aa74 SHA-256: d5a6ab23c7b727d80159950f6190681b7f8fd5567ad42845e2a0e519d4391f0a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nlf8p01a8543ne6lc306tobkdl/43835206944.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e108150d7---84209971796.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0eb27b52---61648588995.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da5bc221c6a6af495a059d6d319072c8/61619933583.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609388cf368d3---damuxaxujemo.pdf
    • http://studiobaldizzone.com/userfiles/files/kuluditepalopunozi.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/52f141ab13ca4260cbf9c7d2283dbb41/28909177190.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160984dfbc3445---gagawejani.pdf
    • https://studiorampinelli.com/file/gufeturoduzonoraw.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ogd8k7b3hv2u8q4kb9tt3hoie3/61262914043.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b230a2676---76061012366.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77576bd02f---zemikowojakubi.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p9p05u7en6mi016cf7b2h8thq5/xubasenose.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/85071638240.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/49434426745.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160975ced89de8---45592884947.pdf
    • http://agiusfuneraldirectors.com/files/file/pidajazususapinek.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d3555bc5a---38755233314.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2731dfba---22294396125.pdf
    • http://osc-pribor.ru/products_pictures/file/11957633.pdf
    • http://acpiindia.com/userfiles/file/74321438182.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7g6o9ag6jo1f4i9fohr722q1a6/jovopopedigilisu.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4bb9333a---94932100799.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/004a9c48dd0edc8a6e101a073771dce1/57942481409.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8bm9t0s3m23dc1cheuhi2rd7n8/jinasetiwebes.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb466b4365---12271303653.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nuxt+global+scss
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
font_01_sfnt_off0001137b.bin
f796f1ec2fea9fc118871ffe9a951e330482ebd19420015ac76f37b10e41be3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10296 bytes
font_02_sfnt_off00012ae1.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 1732 bytes
font_03_sfnt_off00013311.bin
b0528684c8a2ae9aa73904c705e40f6448015564ce2d603dd72fb27cf20a5224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 19352 bytes

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