Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ed06fdd749969a…

MALICIOUS

PDF

88.4 KB Created: 2021-07-19 15:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 76085e30abfd406aee9f6b3439d53169 SHA-1: a35b2bdba12e56eda24f830d7ff91d76ee654e08 SHA-256: d6ed06fdd749969a29004af8983214e3ab1af267d02dbd525ab6be6445d8c0eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3ea07cf4---9899167306.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2fddc8b4---15937169831.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ce997a74ee8ae3bd69ca26c3985eecb8/37958500787.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210610061744_ijg344.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e520589724---95919373975.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a1495a62b2edb856d4b25a2d415dc63f/zazonobujuviwumela.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/54462606995.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d74e1bc4---rulupesu.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/zozalor.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb8eb7da7---ketova.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/89637829659.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8m3k2fjc9bg3ub762muq1lm716/99805051748.pdfIn PDF document text
    • https://subarini.ro/mm/file/72372576931.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/87261238135.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/spvp60u5hsmg9nh0786nth24v1/dobediwob.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96eae334e---ligubutiga.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d491dc39c45---82899449059.pdfIn PDF document text
    • http://usmleworkout.com/files/file/30311301167.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9904d38455cb27a852c972294336d146/94315492279.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/tagapovezinadugejozumopab.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160929b3396483---79518767980.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc6993ff7---55970358671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+long+can+you+freeze+ribeye+steaksPDF 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_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 11092 bytes
SHA-256: 0817f1d4168a8e53ccc0efaaa2a1b96c06978ca091b1dcaecbf7a7666a038dff
font_02_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 17280 bytes
SHA-256: 158c236f8d9618e450dc14df784129e1bba5b56499b8dc9203f6f3c0cf51e9d2

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