Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3218b5bc116185…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 13:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd6603a8549e4da53e94d2dade4ec8f7 SHA-1: 47039925da7433f7b3eff390ab8a11b6690fc990 SHA-256: 1c3218b5bc116185f46e22758790f1696cbaf363b8b8f6cce33f9209690a1627
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of link farms pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution, as suggested by the 'fakaza app download apk' UTM term in one of the URLs. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=fakaza+app+download+apk PDF link annotation
    • https://et-auditing.com/userfiles/files/59251216800.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/dibezuwiwaxogilodamaxeb.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/76171442640.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161338b0cb0cbd---61087868185.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404b48edaf---77618886372.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/gimexatebusofupelefumezux.pdfIn PDF document text
    • https://taperagi.com/contents/files/53380258561.pdfIn PDF document text
    • http://qdcmd.com/data/files/fibufijudixubasuk.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a74310f84b61f8da1190244738d1f2e/lupenujofegumunidi.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/13624517355.pdfIn PDF document text
    • https://triosms.com/userfiles/file/31817139761.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1c4730ab---49936573766.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/88906579540.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd118c6f9b---99036641339.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/savarava.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/47415769350.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fuwafunekamonujulodexo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zikogexiredavebaw.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/goxiwozigizibovobidigeju.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/numolasegopuzozasakadixak.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/83733001641.pdfIn PDF document text
    • https://xn--1--8kcaIn macro / runtime command snippet
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 10012 bytes
SHA-256: a316c8b1426eaf634bf902e7b81db774dc15038bf9a50a70090c4ee461a926fd
font_02_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 17084 bytes
SHA-256: 2954daca02a7989b7cbca4046603a985fec63464a07499d4addd6ceec7f9c2fb

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