Malicious PDF — malware analysis report

Static analysis result for SHA-256 61efff225fb5adc2…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 08:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5cfab2e2ee149320bcf9192f77eea5d0 SHA-1: 157dd1a5bd54ca7b3869e98d4221ea89c827a3a2 SHA-256: 61efff225fb5adc26815345069c3e441f20ec74e39ec3f387bb165a9b7d738e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, likely serving as a link farm for phishing or malware distribution. The PDF structure and embedded content suggest it's designed to lure users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://krisoc.ru/uplcv?utm_term=prenatal+stages+of+human+development+pdf PDF link annotation
    • https://mimpishio2bet.net/contents//files/66914280749.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cfe012ed---38645590832.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160824f2ae4f99---niturizivimasuledorevomap.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/duduba.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0efk8sr8lb0ch4m783in9atrl4/58403530614.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dee1153fc63---radolove.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726ea77ace4---dazipagepimojexejuxuf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d3063ebe467d290c2977dc6e446bf39b/43748036257.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sejebaluke.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/nebodilavusebujopevuvo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/59830581278.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f24b2621c5b8a95926debdceb2061fa5/bezokazada.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/50d0652d4adc52939f1bbbfaeaa03403/40155132654.pdfIn PDF document text
    • https://masihpt1.com/contents//files/reresonitemebutunal.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/87218887468.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kufepixi.pdfIn PDF document text
    • http://orthodoxnews.us/file/75215841539.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/durisevalakado.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/99458214162.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1a984f29---885792645.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/nupijupozopigewafegixulom.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160920010660f2---43109831628.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_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 19328 bytes
SHA-256: 114ed4fb5cb83da14a486bff97c0a7f2eae03817d82262137d530da1fc273787
font_01_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B90 11020 bytes
SHA-256: ef96485e0c893c8554de0bc1a5278ce22bc749e6bf3cf6e2d060b17e56c194e0

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