Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44d7b14c79622c9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 17:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d9c4e37288713a88de624e679254214 SHA-1: 810b601866984160516059d5e574d6875a05bf19 SHA-256: e44d7b14c79622c96e18519c75d424e022121ef157a64d9c30e3e9b6e17c4a5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. Embedded JavaScript is also present, which could be used to further obfuscate the redirection or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://hoanggiaphatland.com/uploads/image/files/416880554.pdf In PDF document text
    • http://avtosfera28.ru/userfiles/file/26358662221.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/62477897862.pdfIn PDF document text
    • https://aildf.in/userfiles/file/xolukuvakosiroxaxitexagox.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409d5130c1e---84710284361.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/92877903169.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/80683635042.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/53130397388.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/boxogik.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/804342386.pdfIn PDF document text
    • https://tcremich.lu/files/files/30628826708.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kadifi.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/53011580832.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/42546729307.pdfIn PDF document text
    • http://www.bash.cl/media/file/79954311201.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/3969259452.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/38908473055.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d12ea10c9---20654371028.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/vazosurikoliral.pdfIn PDF document text
    • https://gencatakan.com/upload/file/riwisanobixuju.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/74139999400.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/nuxomipaxefurasirominedof.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143267ad2bef---74632253008.pdfIn PDF document text
    • http://falerisztika.hu/tmp/81927116927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=save+texts+from+android+to+computerPDF 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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 11076 bytes
SHA-256: e96665e429a4dba95e4451ac6bc54e969e85c2692c9deb1c68148201f2045cac
font_01_sfnt_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 18232 bytes
SHA-256: 7f9b11d94e2ed7e56ea485b17b7a1601c1f7725d1e3ea8f71828a92ca7a146e3
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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