Malicious PDF — malware analysis report

Static analysis result for SHA-256 187ee3d97314935c…

MALICIOUS

PDF

107.6 KB Created: 2021-07-02 02:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: daa20e50f88dfedb24cd0e7f0d915a6e SHA-1: ef6633d2ec34d8730e1cdfcb377e89c8013a7dc5 SHA-256: 187ee3d97314935c66fd1fc87fd7aa2e0188d4545925ae92922c7e6d7cc88e3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, indicating a phishing and potentially credential harvesting attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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=open+source+html5+templates PDF link annotation
    • http://alarmy-kamery24.pl/userfiles/file/faruxokolotivuki.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bokezuwonuveribamej.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada0fb0165---datalefameri.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/bumazupenobipi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0349fb97fd---182513790.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0442d329d---88907579314.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/25729912434.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/eifls5obaqvc3d75e6l3vng12a/tewileg.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2cd0485f---32076683286.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/629a6992a629ddf64d31c5637d161b5d/1943525801.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/59793015793.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1793a7384---47283413894.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/33943417253.pdfIn PDF document text
    • http://sam-global.info/files/file/30833561727.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/suduzodenipom.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9bb9e6d92---40380493810.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c5b329fe55350cca28e76de88e634043/soxezunutepenelaniwebiraf.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340837e1bb---vevawamimaxafodutabivana.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/80ff4e75400f30108771f4e3753d8bbd/97442957786.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/po5knid9dob2uspvntt389e1l2/99835596409.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9146d9aaf9ffc1060e9a25441f87089/34640303116.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/vawixewife.pdfIn PDF document text
    • 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_off000143a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A1 17292 bytes
SHA-256: aaa72e86a292e6ca504947e126186daad9e7d95947debf58f0d6b33ceeb22843
font_01_sfnt_off00017092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A9 10804 bytes
SHA-256: 92e1669bc5f482184190e802320b42475c06766611c7ff5f03bde15cf141f3d7

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