Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a83910f7dee1d1…

MALICIOUS

PDF

91.5 KB Created: 2021-07-06 11:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 050ef70727f2a0f3b96ff5fb4db556c8 SHA-1: 3d3a8fac92b6760aaf8ef2062a8f0db829e31941 SHA-256: 22a83910f7dee1d183018cee9a2d24ab6028dc723d3fc91e02fb9a92536ce87e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The PDF structure and embedded links are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084a477e2f92---votamumofixabizigoledo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb430f0c---94438235928.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9115c33b---55038519280.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/rm60dl03ku2lh5kan8evr1p4ju/20745296751.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945af43c64c---dusomaviwimani.pdf
    • http://angelescare.com/userfiles/file/9280895445.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/nawow.pdf
    • http://irinaburmistrova.ru/files/sexixuf.pdf
    • https://inncredel.com/uploads/94957267095.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/75laspm2u5pc0b134srilfs5v3/83134792817.pdf
    • https://contabil-fiscal.ro/mm/file/mefoku.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf59ba2c9---23440551851.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/85617791502.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fb833aa6e---52274153843.pdf
    • http://leebyunghun.org/new/upload/board/files/80197908173.pdf
    • http://alexlunacoach.com/img/editor/file/fiximelebogotalo.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/7105477242.pdf
    • http://longthinhphat.net/uploads/files/fenetilivilasefipigikamoj.pdf
    • http://fedime.org/imagenes/jeloxidifogitozug.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4062c29d---65454701169.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf167fa68f4---litajawabiludurijawa.pdf
    • http://assistance.uz/images/shared/file/56839190473.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/t95dl7vj578maubpec33ph2hpe/tinitimonolidorujalonafu.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/vimemutakijimem.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160701e0d707b4---taduvifiti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=we+stand+and+lift+our+hands+chords
    • 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_off00010369.bin
984715c87d0ca4cdee80aad71a3b1e514fe2fd51b2ba7465934fd1895b5e1908
pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 17104 bytes
font_01_sfnt_off0001304d.bin
45938f135ff3c462295bb48aa6b04cc9c26070f5e64bab222b1a2607ab137276
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 10664 bytes
font_02_sfnt_off000148b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148B9 16792 bytes