Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5f75c1f217164e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 03:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90becd163c75dd723e5906c47c87f08b SHA-1: c224ddf39bdb5868fb9f09151f440f7e894297c1 SHA-256: dc5f75c1f217164e8dd5b2ffaaf2a23f8daab9f0836f1f353fad59bba82f072d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of numerous unknown URLs further supports its role as a distribution vector for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://alemotta.com/resources/original/file/33131700895.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gg63i43molju4loq2lrv1ltmf1/rupitegufivoxibanorunep.pdfIn PDF document text
    • http://praguetransfer.com/files/file/9219352819.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/vuvuzeduwubeg.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/57086101540.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/86544710254.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/51407146752.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/37ktu5adg342jti9dt1b2fmrf6/vudomaros.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2aab64a0---gokalop.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-18/20210618073227320719.pdfIn PDF document text
    • http://htwy.com/upload/file/lidadunifubitipawugirapos.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gubatajesufaberokor.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pf1aq9u3mhcm46npmqdjbu9mob/ratudasapaxuzibemozulufun.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3df430aca1bde50e00ee4e36ba97611d/85522798505.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/tavalud.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nibujatosarefowadugu.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/10112417103.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6f4a4211---ziwaberikijadedag.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/fukeroko.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f206651f46424fca0e719307cfea23d9/memujedosijovaxepefixe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85286e2c5---55566970205.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/60956a1493e5bdb6cb21ae4d88a0f98e/tabigemimu.pdfIn PDF document text
    • http://sns.hu/_user/file/74226346216.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a460f729f6f---59392594291.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a233b283f8f5814fc1d44661f6805524/xafiridofukufup.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/57250177680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=characteristics+of+living+things+word+search+pdfPDF link annotation
    • 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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 17028 bytes
SHA-256: 4cc4e4b083c3c591131fc3462b260f5ac3aa9f4fdb1aba739bcf482ffb4cfa29
font_01_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 11084 bytes
SHA-256: 5c10cf0c681aa4b780261bf6849fbac112e5115d1ede8bce57ea8abd1a59630c

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