Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ff10cb788fb9f3…

MALICIOUS

PDF

85.7 KB Created: 2021-07-16 07:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d96e2ab3dc6d542847cb3a183be043d4 SHA-1: da88aaa50e76e3e24ee472e493940b7469645918 SHA-256: 90ff10cb788fb9f34324d917e42f44659f852ee8df92647d3483246a523e6632
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=christian+truth+book+room
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/vpctk7v86ihkve20h7ialbb767/puwerofofavo.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081cca895656---112008478.pdf
    • http://www.jindatunnel.com/up_files/file/7305006015.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/dc54b0fe352d55078fd1b3531a104236/lokomazi.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081de4c58594---40353919093.pdf
    • http://sattosushi.com/uploads/files/88510295197.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9ec7c484a902a064c80e164271e4059a/76477539768.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5292a6663---5941206742.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/737ad61847cd9a67fedcc42b43f5ba05/tivaletelokudawazopo.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cnfigsfqhstrfimlg0th68pn2e/sizigukorejalaxoloz.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160843b87774b9---38265271383.pdf
    • http://shriadinathbank.com/uploads/kuxemeveropopov.pdf
    • http://worldprint.su/userfiles/file/72130238113.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/85fe9ef19a8d28f3be15dd7858ca8bac/14811551125.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a34818ebbb3---65762698183.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77624502075.pdf
    • https://kompaspt2.com/contents//files/18591190503.pdf
    • https://artbynela.com/uploads/file/60997358975.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad5a67e24---26823903447.pdf
    • http://progfin.pl/userfiles/file/tatewotixewenetesomigadip.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_off0000ec0b.bin
b7536ce2145656e583948d36e9d8ded02a1394f62384a8db38f93720e0276027
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10556 bytes
font_01_sfnt_off000103f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 16792 bytes
font_02_sfnt_off00011c07.bin
72661c0031102e830abfaa952f76577c3f1346d9453a2a3d5e32a932f25c91dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 17520 bytes