Malicious PDF — malware analysis report

Static analysis result for SHA-256 157ea32e5ef72539…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 23:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c905a9dfe51ac3c7b47d9200fff60772 SHA-1: 7c5c79d6c1cce3338456d6826f0099bdf258a2b9 SHA-256: 157ea32e5ef7253911c3fb087b8d8746ffe0c46e79ca2f5e2fad6152b084d5cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://lws-realestate.com/userfiles/files/44279996458.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b314efbde16---18512687210.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/ronus.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ca772171---8478501832.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/guvem.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/30018304062.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/051f7d720d4662bed1fc3366e6cd9ea4/lunukatuvudefese.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/65586674894.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb76c2517---rovovubolejur.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/pibumuzonopekozagok.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/5927588682.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/nusokobo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/honiqu5eqfu9p1o5eofflqhp0o/93407644649.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/20556689606.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ac78ec1a7b0---gazeniwebifuvawadapejadit.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f781ea054a4---26944896397.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/oeo242e6ii6k3qrmffsebht6dj/limijavalolosaxababevi.pdfIn PDF document text
    • http://kme-kme.cz/files/file/13462528731.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/89230372144.pdfIn PDF document text
    • http://mesterek.net/tmp/tuliramuzepewujot.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/dimagigixexeruwiriv.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c76c911d6c---88872221560.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/sulobimotuwupegoseti.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/58263191978.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b642a61b4d65dbb3f945f790e3d56eda/jenafijomilow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bootstrap+4.3.1+documentation+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 18856 bytes
SHA-256: 84c4d345e13f7dda5e86466d631ee4b24f4861616963d0e94a951d755bc312a4
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 11256 bytes
SHA-256: 05be441decc641a13770f67f8c28ecf8813f6a702ca19b47733e36c9bd0f2c61

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