Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f637f7454fbec4…

MALICIOUS

PDF

95.9 KB Created: 2021-08-23 15:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 257fd150b5538e65a7b1934ed8ce233c SHA-1: 50117b17be2519489c9dbc02e9767b5809509f0b SHA-256: 93f637f7454fbec4f5facfc41cdcd9b5b005f4b8c89f40aa7f6623c93a1431aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal malformed streams and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the PDF acts as a lure to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cvk9qtp4bs3kc9o0bh7bpo97fh/45999635918.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/pafoj.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210618_85FAD9EC4692EEFC.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/23131607225.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/95793131107.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf5b180ee---gitijowizepefoma.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4efc9193---butusiwosel.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e711e1b12b9---42247771031.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/mudeleraxatijamovofom.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7cc00b05---xuwejunoburomomame.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608678b0b394f---giduresofibidazipubebi.pdfIn PDF document text
    • http://adikkedua.com/contents//files/viwoxakatefimunikazunife.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab137996df---retozig.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/vumobuxajefoxusigot.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/3290587568.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/85720592920.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/523c3f02ec6a00f3e5501f9a5e2e669d/5818799373.pdfIn PDF document text
    • http://kalikraft.com/images/file/5774790837.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6097b51bbf---26758808030.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/pemenu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80e8d9eac---58051710506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=valedictory+in+a+sentencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011a30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A30 21048 bytes
SHA-256: bc2f91b92e31f23107c910c1b9a1e3fb1d4a88f0061bb4e5c76d630530932c00
font_00_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 18888 bytes
SHA-256: a1e2b48abd8da18827a79a12a5d193de198c50b47644a5b6b80537fe06bc8f94
font_02_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15778 10444 bytes
SHA-256: 0243b62211fe39780edd1d9809b96347fc90268ecd992035ccf64bdd385d2cae

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