Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf7e4a5e59e5260…

MALICIOUS

PDF

102.5 KB Created: 2021-10-06 08:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7fd4a5f9e479d2e837bed67b568a2963 SHA-1: 1a3cb576609491e9ab378dfa1efa9c72253d3eb1 SHA-256: bbf7e4a5e59e52609185ee25e9ba7f45af67229e9fcda3fc3d705c43688f98be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly support a malicious classification. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://coretry.ru/uplcv?utm_term=clear+throat+after+meal PDF link annotation
    • http://euromarkcreations.com/new/fck_img/file/80086364864.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/sodazuripegaruben.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613957876ef73---lodobofezofovudi.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/85468687067.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/mirotapilanefama.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/17337667700.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/depinabudopikuvuporewepob.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/d546gpioltc02gh25fjjmr65e5/69941792333.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lovigubekejarugo.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/6154289415.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/51234260293.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/88182478173.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/mokotebafil.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/47633975937.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/notejudujizaxilafepi.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/jemulavodoremupekelufoja.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1615c8754d11c6---rupimaguzixodavivuze.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/27677670553.pdfIn PDF document text
    • http://artospace.com/pics/file/51208797357.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/sofufunugepido.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/78227107403.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_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 10148 bytes
SHA-256: ba8dd4843067597e1917be44d32754a6fc28a16ce9ccf7801688d71f8002058b
font_01_sfnt_off00013e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E43 21160 bytes
SHA-256: c3f0fa6a4fa4a7892b849cf003f70377bd12cf4a681604f0251eeee3ea5a71f2
font_02_sfnt_off0001749b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1