Malicious PDF — malware analysis report

Static analysis result for SHA-256 550e535e63b93127…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 03:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06b230fbe2ad31f36d5b6120047bf95f SHA-1: 6e22bbaba7d8c68f26a90ad2c3b71fa568a3ef1e SHA-256: 550e535e63b93127310d603ec3a8a6f0f46366c1e74d2ef4f0831b9628bb3090
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into clicking malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae25584e17---3258230297.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073239b1a203---99932604390.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b769c56606e---97634521726.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fc76ad90e2738fa502eb15b2c1f6f6e1/rebawovegabewam.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d40378ab9e---54426312359.pdf
    • http://eortak.com/img/fck_temp/file/12430724820.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d181f4909f6198aaaadd7acc0139ec0b/waxabizikutedudarud.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45d37267a---37548370273.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4526b072a1997693145acc00dbe82426/85801834875.pdf
    • http://allasclub.com/campannas/file/87282825208.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/70f62grl1nlp5qa6lp2m1q19h1/34211729088.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b98597826---xazuzekutolumesosok.pdf
    • https://cottonweb.net/userfiles/file/10838360699.pdf
    • http://mmbc.cz/_data/user_files/file/99755955952.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ba7a2982---zomilebakivobuvel.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9da2c00c---fofagukejutamigogesara.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160857975d17b9---21279700333.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2990e3bec643d35d497b1259a469610b/81894107007.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b4dd356b---2106037093.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/596c21bfbd92a3b623c955f32cfc6856/76582721600.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4221326e5---xodotezo.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160921c542f5d4---98758794468.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0997f2f44---30263543779.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b444bf740---nonojogetuxebij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mfg+meaning+business
    • 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_off0000fac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 16792 bytes
font_01_sfnt_off000112d9.bin
c72f1ee6c7aba6d7b8d06f88062abd447bc9dc5216f542f468797c5283e46da7
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 10424 bytes
font_02_sfnt_off00012a72.bin
dc66935712c74914de86be5df4a76bb4a12b311c9979a8b2996229b763fc7993
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16956 bytes