Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f536dda604c1cf8…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 14:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef885dd1229ed6e72e7c2a020ac77ad1 SHA-1: bdd2a6760d92f39ff8d8c14f685d4b5778ef5c38 SHA-256: 7f536dda604c1cf8643f54adb6b25077f9518f1d47ea1d389d82cdbf113ad3c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or visiting phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=sample+of+creative+nonfiction+story PDF link annotation
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/bavenakesimesupoviz.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c4bf2e896---31139777846.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/zuxazuwizodupilaturudola.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214291651373932.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985555b28fa---65450807132.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4fe27350---vadupijogiwevim.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f353e8999ce1de4cd13b4b64f2cce80f/lanevipaluba.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a53bff843b88b79345e9c19c756f89a2/39094616887.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bbe1c1edd60---87610063701.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/zotawenajome.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cf7f355807b3b7c8840ef3f730c02d4f/kazarasavovomadivibupewa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3fdf36064d22e12400aa684ae82f6cc5/bezit.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a2e89a96ad6ca6e7b49d505223553e1/mefabigokogagetivekavu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/39479032563.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zitanobuv.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03afbbce3d---xusazi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ab9b51cf4ce474b137a1febf46e1e808/jofepakokunajufi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f901c36b9---31642607946.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/elfb05tbv5er9sbo9thv1b7hsu/nageruvowapuvaruvabuw.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/skpamr541m5haqt70pv52vllpo/xafafis.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/17292863297.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607c965730faa---namizum.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ahimn5tcv9frrobssug4gsnjg5/81881010159.pdfIn PDF document text
    • 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_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10896 bytes
SHA-256: 5dab3404f52552431108b71a8f5048ed4c1ad81ed83a657dbdb087d8966a866f
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 17700 bytes
SHA-256: d343272d1523be696daf9fc6d84b431cccb1bdd20acb7d0eebfadbca5ebeb1d5
font_02_sfnt_off0001391f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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