Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b10c3fab7e08c…

MALICIOUS

PDF

78.2 KB Created: 2021-06-29 00:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b0c4b53aa40a5a53a3b721aac9328bd SHA-1: d45a44c79d96ec0be83a29653cc21a6f47a13552 SHA-256: 274b10c3fab7e08cf587ef5e1d6014081a7aed1a9f40905f17d0fd39373311c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607559e336aba---gagemuguxuzi.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/777e57d58210bec6629ab0196d310499/pozodoravaxanilux.pdf
    • https://cytairtool.com/test/userfiles/file/20210626_ce73d.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/429a9f71e14ee735539863f9ddfd1b01/67523748219.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160907ef04f6b9---vosapenatujukapaf.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1lem3h0t1pugllpeqr9rpghbr4/97492543743.pdf
    • https://daaeportrett.no/upload/file/26276773492.pdf
    • http://accessprecision.com/userfiles/file/xivugiwukepozebolebajukiw.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf17a0175bc---mawejasuzuwexiximogoxoku.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b799037ddced05734f7bcc6b032bd1f7/29478215432.pdf
    • https://unibel.pl/pliki/upload/file/31754431651.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56a78d001---lepubujamitukinesibeberuj.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb75b6962e---41897752961.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27633358bd---porofajulu.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lovli08ioo3906j6ah24l83tf8/84143526560.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0513343e6---53639484543.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca52e74b11---91262871241.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b827eed29ee---23283780273.pdf
    • https://activepymes.com/pub/file/polewikenajuzopulirobirid.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c120c77bd63---87119255327.pdf
    • https://nguyenhungstone.com/uploads/image/files/31357873426.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/33690190234.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/afe95105a5dac5152c616be9b19234a8/69431316960.pdf
    • http://allaboutdowney.com/userimages/64108604836.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0dcf576e16ae0373564ee7fc0c1eea73/11286562525.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chat+rooms+online
    • 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_off0000cf64.bin
19668f43163f8e2fa12c2ef1956dbd6d6c115b8547b626e52947f8ddfa7f9c14
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF64 17168 bytes
font_01_sfnt_off0000fc2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 16792 bytes
font_02_sfnt_off00011442.bin
028931040900dfb9e9d03eea4ae0b25b40255a17893a13ece3d55fd4f1c23c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 10404 bytes