Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5ead73bed64766…

MALICIOUS

PDF

167.4 KB Created: 2021-06-26 04:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3251eaebf2855bedb80721ca9c52046 SHA-1: 53d6ca6182ef1ddc6663610bbe6d6df40b324092 SHA-256: 4c5ead73bed647661a7012c116fc84082d98957ab94fd7059b4b03277c38fc33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URLs, many of which point to WordPress sites utilizing form upload plugins, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://medvor.ru/uplcv?utm_term=pinky+finger+gesture
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o848r7aifq1hdcafmvr1aksf90/2926746608.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/tojulosikonipoxifuvi.pdf
    • https://franchiseharbor.com/files/files/sazuvokofanawupe.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/16b6cfada930942f4e8e8801e156237d/jolozebojebobemenatoli.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/fedilafugedisizewiwiz.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g91cs3nl7qgfj11d3bv5om4j1r/lobuxuneduk.pdf
    • http://diclenakliyat.com/userfiles/file/kureremofawezojinazuve.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xekigorazebalazog.pdf
    • https://pypconsultores.mx/userfiles/file/53837355444.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61c0af737---45930243872.pdf
    • http://tafgambiatours.com/userfiles/file/2521692687.pdf
    • http://happysmilecard.com/uploads/files/pegabefaxamuxoxafadatomok.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcda278078---sivafakasimiru.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb1358e9a---ravewa.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e082a68e---95370448146.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4q5tfqp6tk1k2l9b2p1d43i7u3/26310612449.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/bojexixefibodano.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/pogokemerodevazirevekuwo.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b2796ce43ea4c5bd4709aa2d66dfd967/19605277026.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/291dd25929b954a91b243cad961f5094/89791421324.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/57796494855.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c3172baae81d18127858be98f13bdfa4/pafipujamijokel.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n6n7cld3hj3s95qh1tqsuik0h7/rajerokiwenodozinuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002172c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2172C 16792 bytes
font_01_sfnt_off00022f3e.bin
9ddede884b075785dd41200c780f33bf6513830a44f4edd02b42e6dd60254ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x22F3E 20504 bytes
font_02_sfnt_off00026282.bin
e796558a21d1b190ca30dead34b70a425c03b37c1e5768954aeaf26e49cf1efe
pdf-font-stream PDF embedded font (sfnt) at offset 0x26282 10368 bytes
font_03_sfnt_off00027a14.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x27A14 16140 bytes