Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7878508e18747df…

MALICIOUS

PDF

94.5 KB Created: 2021-07-06 04:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 712e26a484a33b0644aefed6d3bce1e4 SHA-1: 76bd6ebdb3646152f010f4330614593cc6dae8b5 SHA-256: a7878508e18747df6f9a6544f4ee76d4b67a63963202f4bdbfb317a2819e667d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=landforms+in+the+south
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/aedf85cce0ec3e408487e8b2041e075c/22183651224.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1a6278c8---61648774060.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe8e89d1e1d4a7d2593e6c9df7e5f196/47373198725.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d27ed6823ec2f9b0b1f5b115f524eb9f/72173295527.pdf
    • http://rauvuonsach.com/images/uploads/files/97737857740.pdf
    • https://fl-forever.com/upfiles/editor/files/fezufiwa.pdf
    • http://www.hon-ro.hu/userfiles/files/73184577571.pdf
    • https://tecnibat.net/uploads/archivos/naluxunatepese.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/fofivopidogiwipuxexam.pdf
    • http://fitviewer.biz/files/file/tuduparewewibipikevodapo.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856b34c4e33---99742163617.pdf
    • http://ufnk.fr/app/webroot/files/file/juwitozatugefeveworepiwub.pdf
    • http://royalgoodviewresort.com/Uploads/file/muponevetaratizoke.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9df53660d---92824172941.pdf
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/muzagososeduzel.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ne1d6o7huupeaa8l0pmtqgdu97/zamubigobegumixi.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8bp3sdfonkolfkp9sb696alj31/93099634516.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d29015c1b---rajugetavewuxifememokus.pdf
    • https://monyetmesum.com/contents//files/fojajumunikus.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb438c664---xojebipa.pdf
    • http://turnyras.lt/Files/file/sixagunogoxegezapa.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8b64ac41831b0cb49ccb000b1451ce6d/32345315834.pdf
    • http://zge-led.com/luodan/images/userfiles/file/jevozo.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ufsv7c13l1ati40taca61mocv2/gebebalotovani.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c171bab4---jakevijagililawodarabi.pdf
    • 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_off0001102a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 16792 bytes
font_01_sfnt_off0001283c.bin
74987b0612f0f62ce0b8a25cf9fc275ff757b094994d2152be59df828ded33b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 17352 bytes
font_02_sfnt_off000154d5.bin
9d8b437311d199fe8b7a0c25e1e889ef935d6f2b40a61fb0eedf336fc098288c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154D5 10632 bytes

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