Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76baf5d752112dd…

MALICIOUS

PDF

94.2 KB Created: 2021-07-08 15:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 28e0a06865e906ad1dd3fb8700243996 SHA-1: f0f67722bb9b323eeb845352ede0e2109d4cd450 SHA-256: b76baf5d752112ddbb53a58b6a5af35a40dc27674d9b69f9b4d4bde8eb9cba0f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms, suggesting an attempt to lure users to malicious content or phishing pages. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://oresteruggiero.com/userfiles/files/84098072708.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9eec66bf6a1273fc82cb4db6e515a525/kaxaporuzazuzobizav.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/biledikilojitegelobube.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/juruwuvelezazut.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a28b10762af72246ef48f2d7c0504a42/jajojakodiwoxuvok.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1b7f4a38fcff672ad4525005a448e655/70900385246.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a4a2ba93b---99296353268.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/feb7aa02aa2f2a630035e25225d74668/wajatojomegosuva.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7074e590a---60787267281.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b7c2230b---wemujofu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088888cae830---86415236106.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/45080021652.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d4a162fc---92649956290.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ek92l24d283s737rp1rtallhu/febegosu.pdfIn PDF document text
    • https://chpcentre.com/files/file/72643630362.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/gagexemivebogilemupa.pdfIn PDF document text
    • https://puntoagricoltura.it/file/sumebarixikuramotunujib.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607449b0b395a---rixomezisawigatewuxafosa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6363eca7a---3819283136.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/68764175580.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31394271e---sujomeramegizopozu.pdfIn PDF document text
    • http://charontrade.hu/data/file/61925088049.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210626185951101.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ca0f8d1---79423348288.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/12808423586.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/wekifasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=most+beautiful+guppy+in+the+worldPDF 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_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 11208 bytes
SHA-256: 4377195fcad864129eaae67b7bcad5555b8e0c1f3e06ade895561ee6b34b7265
font_01_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 17212 bytes
SHA-256: ff5a3bf42e478725e5a57f5bd0d948e527ae92ed0b6d0029b751e30aaa088e09
font_02_sfnt_off00015368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1