Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8987bc573ea3e35…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 03:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab6847ed13dbc9e2462af603670b1acf SHA-1: 9a16392bdebebbd655a612ee0b1cd15c726dd04a SHA-256: d8987bc573ea3e355bf160dbfbe6e67b1ad832ba72e3a0561fba3c887cb62425
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=national+inventors+day PDF link annotation
    • http://dharmapremipariwar.org/userfiles/file/rolew.pdfIn PDF document text
    • http://www.celso.org/download/wofoxosobetalo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8987990a---kanititotuzoxanomito.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6e28bd754dc318f88b04264b34f59232/kuvugugotawutupesuz.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/aoe2phbhl0v12lh53prp6icvic/mitifewugarefo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb98318381---26400748419.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/litabodeduriv.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609218622c68d---45137326978.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cd09da3570e0d42936a3fd9a821a0a63/ditadogefobugawenof.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608718f384cc5---kubufutetovikosejirisuri.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/55a4ab44632263aaad9200d16f720e2f/88222112208.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a6b5b634---kisadufunomijatanurak.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086e70b30481---61260117425.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/593687c44c36965a0a592392eb961e85/luvakezevuwutumut.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/kotufoweterodunojej.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/92218369702.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/80321034138.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9165a434bf8534dc05d0103dc2da9882/ruxel.pdfIn PDF document text
    • http://liyangah.com/Upload/file/44822115705.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a93e87f5e---lelal.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/56563165968.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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 10396 bytes
SHA-256: 74c8e74c8944a2a77827f0fae5be05fab07eda1dc9a10d43eb9d960a00000276
font_02_sfnt_off00011921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 16944 bytes
SHA-256: c1601f6fd9679453ce7b099a09e4ea5c4666a35ec961456a362535b83fae3e8e

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