Malicious PDF — malware analysis report

Static analysis result for SHA-256 b613a5628a25a430…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 22:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 827f615cb4bffaf12ad2bc848b4a0d36 SHA-1: c4275194244439911e4bcc81cb3c50335a82fc4b SHA-256: b613a5628a25a43064043c846ddea19228243a9555602873090a666cacf4839d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains multiple heuristics indicating it is a link farm pointing to compromised websites. The 'Fake CAPTCHA' heuristic strongly suggests a social engineering attempt to trick the user into interacting with the document, likely by clicking a link. The embedded URLs lead to various domains, many of which appear to be compromised or disposable hosting, further supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://allytemp.ru/uplcv?utm_term=fifa+20+for+android PDF link annotation
    • https://isleo.com/i_photos/file/mililoxuba.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/42693508961.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/lurasozoxapavemuwa.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/95ace72ma3oun6vf5npdsdsfss/42551853440.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nezavegewaniwujafopef.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f77261f3---fulaluwogejinamimixejo.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/kebopipajitibejamelabax.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/60056989534.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2513eb4246485719a98fe621aa8f562d/razazukozaxebimiwe.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1af97901f3d09d176b6235c07f9ceab6/wuforilikozowejedinej.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/49633032184.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708207abcae---kusaludamijefu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb4db8748---4791560814.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/46713825367.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cdploqq95rnihnmo7q5gesbso6/24754583348.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b6e507c3c---12466245333.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65f70f5de---83008329207.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625ebd82b1---32920531223.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3689981796---67174342825.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0841b236---tuvimidobagefuvex.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/55651659510.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/43153716165.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/f65fi9rv30aka6f0uvfk29174o/diwetudimelenejetowupipeb.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/79bb749f44dc2877879927b598212f25/nomepag.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/xafatizolagekafegafoxa.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_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 10124 bytes
SHA-256: e22b44478e5d7889336945d5de2b390511fba96b5ab2a33527a1a87cbfc934a5
font_02_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 17108 bytes
SHA-256: b89101433f37f6515fec591246c534a410ab52f2463c523854f1357cd4eaf82b