Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d18e1559bcd8f6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-11 08:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b7c697a3106c4bef820e99f2d9d52c3 SHA-1: a9dc75c6aad23d3df7ae1433ab282c1254305034 SHA-256: f1d18e1559bcd8f6364ea87bebd4a0bdd196d385e5e0c450a7e928c267847879
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to external URLs hosted on compromised WordPress sites. These links are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887fec3263---wilipajegukufe.pdf
    • http://anpharma.net/upload/files/diguwojorulupagupogixaba.pdf
    • https://marbletreasures.com/uploads/image/files/70306754631.pdf
    • http://generaldistco.com/images/file/52531143620.pdf
    • http://dailymaydemtien.com/userfiles/files/43820743844.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/nosoxotekiwapujubupu.pdf
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/68363911406.pdf
    • http://csc021.com/userfiles/file/20210904134940_ms0gnr.pdf
    • http://lmleadmanagement.com/userfiles/files/nowofodoxudu.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/32960211566.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/tusijopifuzonafulolijowu.pdf
    • http://electric-kernbichler.at/21123156736.pdf
    • http://patp1ryb.ru/media/file/subugegape.pdf
    • https://rumusjitu.com/contents/files/83711404066.pdf
    • https://reformedgeneration.com/userfiles/file/1042423034.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3a6b3bbc---59630365508.pdf
    • http://a-pluset.com/userfiles/95470402848.pdf
    • http://rafaelokazakov.com/file/kulijo.pdf
    • http://soldearenales.com/galeria/files/fafazotelasazigox.pdf
    • http://ytlcases.com/userfiles/file/26645887646.pdf
    • http://shijijiaming.net/filespath/files/20210902092806.pdf
    • http://waypl.pl/upload/File/jewiwela.pdf
    • http://capesociety.ca/uploads/files/sidax.pdf
    • https://autoprofi.ua/userfiles/file/texova.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b653cb280---62969849104.pdf
    • http://hongpakthai.com/ckfinder/userfiles/files/jegivejoxomegebanizusox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=alexa+start+my+day
    • 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_off0000ca0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 16792 bytes
font_01_sfnt_off0000e222.bin
2ae2c031eabe2bfe03b35ff02c8e8178bfd0e99b9b20b3a2096083b3d9b8bbc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 10288 bytes
font_02_sfnt_off0000f965.bin
1dc393834b45bcbb45026830a3ad9803f6f70ac95b4538f4aed7118ecdd3745b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 17084 bytes