Malicious PDF — malware analysis report

Static analysis result for SHA-256 140a7a4464b58d6e…

MALICIOUS

PDF

87.0 KB Created: 2021-07-25 02:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26ab08b317bba20be26348fdee9f27b5 SHA-1: 4dae59d16b7c6606d9bfa786ed56be78ecf656bc SHA-256: 140a7a4464b58d6e2ec14b85cc9cef5bdce7b949a4d35ede66d62d0a637a7b0e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1030ff40f83da2f13a162ff9f84fb289/18126478674.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c5ea1342cfd4749aa4fa62ce334ca48/vejogilibufij.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/0pciunsjgvspkkc0gb17h1roeb/23751644487.pdf
    • http://portalpr-b2b.es/img/user///file/_0266968001625420883.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7782d053---ruwavimeji.pdf
    • https://bestcoloringpages.com/userfiles/file/64217630636.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079510967ae7---gutenigonuzo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vpdu8mmphgupnavj50os5vmr9c/30106053757.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080beee6dce7---kuvurakulegiporulixevu.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/46070538849.pdf
    • https://smilepaper.tw/archive/upload/files/fevudupumiz.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ea3172158b0122119ffdf25edff906e2/96322852609.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dd7b8s8uibhmqm57n66uvb5hib/1483331614.pdf
    • http://savalis.ru/userfiles/file/xuxiwekulekogelube.pdf
    • http://se-ty.ru/uploads/userfiles/file/62943227832.pdf
    • http://autofulltravel.com/userfiles/files/dorugeligorizojarat.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a13997d09d4---19117120007.pdf
    • http://andrewsexes.org/clients/867461/File/95047135869.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jalosalutomefixug.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28da0424a---28879721109.pdf
    • https://ilcaminodaugo.it/file/70568701411.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35016bb7e4---bakuweje.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f77c5b1c7---fexewirar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+founder+movie+questions+answer+key+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_off0000eb01.bin
c40e880a240b6252d35fb9571a0f32bf2a4c51a0ccbf0cf2d88a873e54188d9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 17692 bytes
font_01_sfnt_off000119dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 16792 bytes
font_02_sfnt_off000131f3.bin
bd7165ba36fdec371468556c8984de0adbb28fae98956a0ff197ffb8d7858f8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 11284 bytes