Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e4dc5fc012d3a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 04:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d3b0d91aae477f5506cc10cfc799fe SHA-1: f2ec6b5cf15b1dd6b53f4091c73182b33521d2cf SHA-256: 171e4dc5fc012d3a36ffd6c751755b5d95feeaeefd9e0a1c20a5cabcd682e069
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised or disposable hosting sites. The presence of multiple external URIs and link farm indicators suggests the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=division+of+the+ans PDF link annotation
    • http://cana.vn/uploads/userfiles/file/32626836413.pdfIn PDF document text
    • http://agama-rc.com/upload/files/99678979023.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/penifulowolusuviworufavev.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/99625885436.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d1ff00231---40518705130.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/fanapuvudiriz.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f61633e4a76---20517382183.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/36662169769.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/80466909951.pdfIn PDF document text
    • http://redactron.com/userfiles/file/13424943333.pdfIn PDF document text
    • https://mangallagn.com/images/file/sufokate.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c2309b9591dde1fd363e06f9a349671/64529904292.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/72373516619.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/29510213261.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zezizikuwij.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/30330247607.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zoveb.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a892a3cf7---pavinuxafafebeg.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/30058561940.pdfIn PDF document text
    • https://airshow-bg.com/file/988020469.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/5256188319.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160748e35d892f---69116727671.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ji3t9t6lskd1e53eps2vpthdc/pixowolavomisubileboz.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/negovitone.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vinokutesojujawuviwagenu.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45824464975.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_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 15632 bytes
SHA-256: a95f6835a2cbe4a3e7b75c78d466bee9a5340d6becd1a53b81c90ec1ffe45dc6
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 10232 bytes
SHA-256: 6bd69eccbbd91d40a077708a8850c9b17c74f722b0ef0f7af58ff3404089e254