Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe790bc4ebc148c…

MALICIOUS

PDF

83.3 KB Created: 2021-07-09 01:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: df67890bf0ba024993bafcde5bd7e01f SHA-1: 287e867f36622a8646f27c322428136aba3eadd5 SHA-256: cbe790bc4ebc148c03a4548ed55e136dbd5843f1fd537bcb4b7747932849efbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092250e42818---3117959559.pdf In PDF document text
    • https://victorybear-info.com/userfiles/files/tavedujilovigetazitobal.pdfIn PDF document text
    • https://digireg.se/upload/4856559879.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160861fe8d3498---49475279850.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/61387804973.pdfIn PDF document text
    • http://m2m2design.com/userfiles/41857262215.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/80688675125.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/sokoselipapuzax.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/rimugubisitasiwe.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/46731458571.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/44666880300.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098c552bde21---63941227938.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfad661c6f6---tonobakikawe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/zuxobitijifumunotutam.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kekovanugejebojebekenif.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1f56b828---37630710798.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/73444361302.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096960960f3c---26923183404.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/64685729828.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/68895111129.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b9dbb8f3---78900966104.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe349edb42---zavegafat.pdfIn PDF document text
    • https://chptravel.ir/data/file/90331393858.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/53579089956.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e5314d71---pepepaxawijipejowono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cpa+past+papers+with+answers+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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 17752 bytes
SHA-256: 72252c7aa623856b3480a45f972df6cda00d835c14104adf436f5eec84631b59
font_01_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 10544 bytes
SHA-256: cc4178b7d6afac02fd853e146850fbfee266e51db556bed91593f9f3b15bd558
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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