Malicious PDF — malware analysis report

Static analysis result for SHA-256 f617dd04da815f1b…

MALICIOUS

PDF

101.3 KB Created: 2021-06-26 16:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a185342d51f2bc7c2398b6d8f9e85c9d SHA-1: 2b4a6489950bb22170a2eabfcfbbf06b10142aa3 SHA-256: f617dd04da815f1b87cd6ece4eaadbbb298d84a0986a5521a0e7946c281a96ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites, such as 'garglob.ru' and 'gpmpoolandspa.com'. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://garglob.ru/uplcv?utm_term=father+of+enoch+in+the+bible
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/pexaz.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c579fa03e9ffe9774d82f01ba27b5592/vavaneguzut.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dd97ddd39c34d362802e7a39d612fc76/boxiwebugunoguk.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073853d6a67e---33059176463.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d6f8b4cf---vurojekibot.pdf
    • https://siroyensao.com/upload/files/1352245249.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160777bc13c764---dazife.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9be751977---46868912032.pdf
    • http://pappteam.hu/userfiles/file/48568873306.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ed2152fd---katinedo.pdf
    • https://wickedcheesy.com/images/file/jagemas.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/lpd1b4j2evhkur0k30gs7qf3qr/jikudoxunujabesarifukuj.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e213caca35cddb0ccfbd8ba841cc3fc/62184282782.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/50785388a5d9f1330332d9ad3a1c994d/59729844450.pdf
    • http://fw-simple.com/uploads/files/xapamudofizim.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/706851793b421dac2ec8346cf82010f2/vaboderesinatusowaxabolu.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e4181b7799b2d2cb92e0dd9cd29e7ee4/satisokude.pdf
    • http://wildpflanzen-planung.de/file/kakopiwew.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ebc3c5221e91a9141e18c4b9e3362994/noruwegaxedewi.pdf
    • http://dachastyle.com/userfiles/file/4876841082.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adb99c17784---rujemasod.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bef4546b82f---xinebawutuwe.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5905b335a6---jerexawowaxesu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e41fbbb8872df5c43ac97bad9e41584c/jadugitofajolixibovofemut.pdf
    • https://arerp.kr/data/file///diruzederuxuduv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 16792 bytes
font_01_sfnt_off000117d6.bin
3f5235ff5034b99b1f53e29fb3f8fa87812e310441f395c1c45fadb971f14b98
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 23996 bytes
font_02_sfnt_off0001526b.bin
f91012efb809cb3d5d78f7529fa91853ff63c9526d3bdf1bf12efaad5f0be18b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1526B 17888 bytes
font_03_sfnt_off00016e83.bin
593d2d1b59b6290b2daca35143abcd20c615d4fa7617e8590b65b1b7579098f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E83 10380 bytes