Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c11033412a4773b…

MALICIOUS

PDF

87.8 KB Created: 2021-07-13 15:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cc4bee6e8cb691238373290fc0ba03a SHA-1: 771ec9765027d238f564296aefd4f2c5ec3a91ad SHA-256: 7c11033412a4773b052f460bd67d4a59694e80d9cfcf8bbd775f35da639982f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing/trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting further support this phishing and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff86412b6d---jotibujuwugaziku.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1652148fe---13585268055.pdf
    • http://nsdadventist.org/FCKData/file/27218121914.pdf
    • http://tourister.kr/userfiles/file/xezolozeditoba.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd26cdbe5---nesezujidudipi.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bb04758b4---75651528681.pdf
    • https://majubesar.info/contents//files/xanolovatataxupifixipi.pdf
    • https://addsfly.com/userfiles/file/vuvokerodofavajo.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/294e17de2799dd46a5f48434e3afb403/lizunavapisizosetumodo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d533ac2be3---bejoduvil.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34872f50c---jobafibozotiveveg.pdf
    • http://www.centralperdana.com/file/97622207776.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cb0d3f30---wiriluburegoka.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2e4c00e04e68dab28fbd256f36be52d7/vuzamavip.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f428d871---kuduf.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e73122545571d34a4d9c88c66979146f/darok.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e3d56e3a56e90a93a56aecdcfcc620c0/35175857493.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5f005af00205df7ead2c935d16011131/4210706512.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/leribevavewafatuna.pdf
    • http://www.look4job.gr/images/_user_na/file/mamezipor.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f041cd46c4---murugiraratozito.pdf
    • http://salinasouth.com/clients/11073/File/xojupedupanili.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=describe+soil+profile+with+the+help+of+diagram
    • 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_off0000f544.bin
40b6728fed4674c52f906c35ff6e0e26b37db186218814ced5d5f7795271e138
pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16420 bytes
font_01_sfnt_off00011fe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
font_02_sfnt_off000137f9.bin
eb84a4b72303758dd9ba3fd86aee2c537e597277a8521352ea83f2a75cef7872
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 11192 bytes