Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4cdc1252c9c30f…

MALICIOUS

PDF

95.4 KB Created: 2021-08-14 18:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd0883812b1ca4265fcfb7a321d33081 SHA-1: c3eaafc3f5aac0c2bfed9ff457439b8ce64481ec SHA-256: be4cdc1252c9c30ff3ff0d8ecec18378a0a8542ba80d39682487360d7ce4483d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that likely lead to phishing sites or malware downloads. The presence of external URIs and link farms on disposable hosting suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=happy+wheels+apk+indir+android+oyun+club
    • https://medius.sk/userfiles/file/86622284307.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e7c84b43---jurowoxifisidaxidijorig.pdf
    • http://uralinteh.com/uploads/files/36199995379.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/58f21323dc2f25ac3b298af32ec0abe9/kojizoxoriragaman.pdf
    • http://quaretti.it/userfiles/files/jepoxezedonifedojakewo.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090eab897549---jarak.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c22c720c---lujepanitexobes.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608dff18e5328---8926147780.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dba98ef222f---kataleragomenuwodet.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/joruga.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9rv4m33dldi792rv35i4ls41b7/76822989196.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/r5bo2k1l5iml1i0m1toigko5ci/niwuvi.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xodiwuninofuxanojodozu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acda1484eeb---2343289850.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/rli9822ov8aiimc6ivirl0sril/lozojomifililagesaboxuvug.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8710712f2396f5ca81d0504a87042395/dalujabipetisalogow.pdf
    • http://mayjack.com/upload/files/99957770316.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/21d8c818df68368e5aa5082162369996/bafipexelapu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c606eab52cd---sedeligugaw.pdf
    • https://prestinireedcorp.com/userfiles/files/96318592018.pdf
    • https://aquatrustfina.com/userfiles/file/naworebalugikabejefoni.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d98fe9560b5---vijutomigululi.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750355eab1---63845589624.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5084cd0ae7---lipunisujizije.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f4.bin
1efd2c77aa38f9561cc9b1417d5918dc6a6ffcbc8e1e9336a1149b0e2bf0f88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 18792 bytes
font_01_sfnt_off00012634.bin
0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 16376 bytes
font_02_sfnt_off00013c5d.bin
a2bc4e093b42528cb7f7b6c4caadd52fd05001d959d068e85e6b6e435239e9a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 11036 bytes
font_03_sfnt_off000155c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155C8 16792 bytes

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