Malicious PDF — malware analysis report

Static analysis result for SHA-256 b153ae74ce298ef2…

MALICIOUS

PDF

90.4 KB Created: 2021-08-11 11:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6bc0138dd48b6ed1b3c6ec785c060028 SHA-1: 20d2ef6be6f728d41356002ddd434cb2df243ede SHA-256: b153ae74ce298ef27bae66aa1f861007d00f89e40ec78be78569055eda014de5
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs, while numerous, do not appear to directly execute code but rather redirect to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9012

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://agcslohian.com/userfiles/file/givilusot.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4ebbfa84371167007813faff089d2b11/40424253153.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4ggqgh9i1ba3e9616h1cceqga6/pesofesigupilig.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eea184b04---88116567168.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/20497461757.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/39251586372.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/39848653546.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4b0ac2e5---lizilunowepujarotiposoxo.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/42342948122.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/17419104330.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/goxosezesotaxosukur.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/bakes.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9769e0956d---97566846275.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d19b1ef839329920da21e29c56460e9b/matawuzaxekewekude.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729ec6a5bc5---50786829862.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3eac52777---25516081816.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/lodujudewagevafateb.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f554c9e7a9---gupepepepuke.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/94761449206.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/81900368187.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///tevuwufoke.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a05b27b4c---75692944781.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/q7bb3nsg73rfnve2dvmnqekrkk/83407042431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fix+mac+charger+that+won%27t+chargePDF link annotation
    • 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
font_00_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 10784 bytes
SHA-256: bc53afd0879e15061fda30d3f44b42fa5b8ebd08df198c302461c9c48d0d6220
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 16524 bytes
SHA-256: a58ff43e03cb223d56286dff1e2160147fcb81917b2471587d00146609472b82

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