Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b01a70a2cca2caf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 19:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e57a159d61c77f329b3ec5124b24fab2 SHA-1: 3d26c444bdf9ea9574d75842b8e8808e559b4d34 SHA-256: 8b01a70a2cca2cafc571dc2ee91674c1076eb73ca4c8ac751de68eb579eb45b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malware or submitting credentials. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=mrs+funnybones+book+pdf+free+download
    • http://dekogard.net/deko/veri/_files/junibuwarutijufazujimobin.pdf
    • https://patriciobanados.cl/upload/file/
    • https://toocapen.com/files/22704032085.pdf
    • http://griesvoegwerken.nl/UserFiles/file/jiwivezezubudazikup.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7410e8352---perugamop.pdf
    • https://projektovanje.info/userfiles/file/mobuzavuvibosu.pdf
    • http://yasairamenbar.com/uploads/files/piruvojiwi.pdf
    • http://njchemland.com/upload/files/jukobivoganujakisuzawotub.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614014d392602---33427172243.pdf
    • http://tznjl.com/userfiles/files/kukutolosimamimajemetuto.pdf
    • http://www.jindatunnel.com/up_files/file/rimiboxiku.pdf
    • http://heryeryesil.com/resimlerfiles/16150210442.pdf
    • http://studiotecnicomartani.eu/userfiles/files/tofalobatimuxizi.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134967b43524---wevusuramejuzowotupi.pdf
    • https://oceanflowerhotel.com/uploads/image/files/gifegopevukeb.pdf
    • http://vanprodukt.cz/UserFiles/File/lagareroxefowizoweku.pdf
    • http://stacjaregeneracja.pl/userfiles/file/74518044240.pdf
    • http://brixtontaxi.com/survey/userfiles/files/95756753933.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/50018317765.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/gutumubonijobi.pdf
    • http://crmloccitanecr.com/campannas/file/nifofegep.pdf
    • http://www.vikingmaterials.com/img/taroxefajuxog.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6929266b---nexedajiliritumobulip.pdf
    • https://masukpt1.com/contents/files/62653082410.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de86.bin
3128f4e5878b33f5dd8a79c6021b39ea008377fb538a9c7bf6fb431db34b3b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 17972 bytes
font_01_sfnt_off00010d7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16792 bytes
font_02_sfnt_off00012596.bin
c1c5f2ef008c86302e1eb8b8ffaaa3f8663bac728e5c76bb2e2c31fee54740fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 10828 bytes

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