Malicious PDF — malware analysis report

Static analysis result for SHA-256 62131602dc270449…

MALICIOUS

PDF

77.8 KB Created: 2021-10-13 00:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a82f28020ea5e8aeeb13bce3e7f74db8 SHA-1: 91089ae0e09d72ea376516f7902b6f3ab45fdad4 SHA-256: 62131602dc2704491fd3ffc83346c10bf4cbb09db5abf0b734027f1767adca46
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://ketchas.ru/uplcv?utm_term=companies+using+open+innovation PDF link annotation
    • http://phantasos.org/userfiles/file/4764236435.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f47eb644af---2272654690.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/24595893224.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4321e4738---93923945791.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/goforewapilatemasewipuf.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/15296626530.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/93689659026.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616277dc486ad---liresixopagar.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/24316857649.pdfIn PDF document text
    • http://yljinbiao.com/admin/upFile/2021-10/file/jodanul.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/37608803856.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/63368451747.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/depajebiluroxifedu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea109d84fc---23840718905.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fuvezalomekajumapimo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/zijijuzosafeja.pdfIn PDF document text
    • https://phuquiland.com/upload/files/67970539979.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/zuvefegivejonolatorepa.pdfIn PDF document text
    • http://intertribo.sk/files/rajuxez.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614efa1985b74---sanafaxazedamurigizixoje.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/kuripakib.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/41266700240.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/pimun.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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 17816 bytes
SHA-256: 0172575029cc81adea3682add910da89a854eafd2397cf22f6febab9729a4759
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 10644 bytes
SHA-256: 484da32b838c2694543d6579cdd5bb6180447c830173b98f8ded05df9d1d0972