Malicious PDF — malware analysis report

Static analysis result for SHA-256 136f226148817e8c…

MALICIOUS

PDF

67.4 KB Created: 2021-09-24 20:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a72e13fa1d43f20efd068341d251dbe SHA-1: 8d020a79073c1c3ded59af50f7377ce32e67c65a SHA-256: 136f226148817e8c68a35b4b285969c5aa22a9fa673eff2bdbf3c1542b200f44
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://deesudcoolingtower.com/userfiles/file/70698609110.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f20652a4---gomotelil.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/jufufemalaw.pdf
    • https://endeligmandag.no/e-brev/data/div/vesenibileriwukikubi.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/96707069270.pdf
    • http://studiotecnicodavico.eu/userfiles/files/47975164601.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142a4f2964e3---19692026748.pdf
    • http://kaymccarthy.com/immagini/file/dovezib.pdf
    • http://loveperfectionschool.com/upload/file/wabodixofafugupegopozu.pdf
    • https://arhometutor.com/userfiles/file/28454468128.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad6811d24---xuxasifidegurilix.pdf
    • http://baracenter.be/userfiles/file/mukavelowelinatozupeb.pdf
    • https://renesens21.com/ressources/upload/files/76192121227.pdf
    • https://birudongker.com/contents/files/37357818355.pdf
    • http://www.pilartangguh.com/file/38232102122.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/teligolegeraj.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/vipeduzerijanevef.pdf
    • https://groupburuemas1.com/contents/files/30468839513.pdf
    • https://pearproperties.in/userfiles/file/rigukirimijemilab.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/55094784266.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/wejijetedenat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=logiciel+d+espionnage+android
    • 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_off0000ac03.bin
69fa7409cb9e5b02c6e728c2c09c4d8ee4a022994f2c335e0fe08c3f3e11ee96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC03 10548 bytes
font_01_sfnt_off0000c3e3.bin
298e336a9262b4aade027215448cfed48ec4db59061622cb56a8114789f681f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E3 14508 bytes
font_02_sfnt_off0000e87c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 16792 bytes

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