Malicious PDF — malware analysis report

Static analysis result for SHA-256 2750dd4dc1fcf1d0…

MALICIOUS

PDF

68.5 KB Created: 2021-10-04 06:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9b449e5024dc1d1a95849066c9e5451 SHA-1: 95daa68f1af9c1be5c89d436a30de410d0864000 SHA-256: 2750dd4dc1fcf1d0ece40ceff0c96427ed86b5af906947ecf1a62859f8d3babd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and ML classifiers also flagged it as malicious. It contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript indicates an intent to execute malicious code, likely to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=long+haired+manx+cat PDF link annotation
    • http://ayurveda-shiatsu-nice.com/upload/files/741855688.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/kibofun.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gazirewuvenudexefixowu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/27599362108.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/rovopibafelosisasivigam.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/85202749910.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/milenumarewosesud.pdfIn PDF document text
    • http://przybyszewski.org/image/file/tofelafu.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/madagawebe.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/kuzubopigaronekaligegoruw.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/79c08293193f2af070ad2998233325ce/34427830044.pdfIn PDF document text
    • https://themalc.org/files/file/90353960237.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/ketelawemid.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/kunofifumirefozo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210927_D6B0D285F84AA83E.pdfIn PDF document text
    • http://knipia.com/userfiles/file/mowizomalorivojeweketadap.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b8f4ff31---30175898384.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/wazoru.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/45792c879de21bd9e8b31ebe8b4f38ff/23880373745.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/vuwodupulobeluvitu.pdfIn PDF document text
    • http://pileki.com/imgup/file/vomobuvewutabijotimi.pdfIn PDF document text
    • https://anaksemut.com/contents/files/zuvokuba.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/jumidewudumiderasifasipig.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/pidixafov.pdfIn PDF document text
    • http://imoroz.by/upload/file/37210454044.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_off0000b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 10664 bytes
SHA-256: 01827d51532b2000bd3d2900ed2dd01e09ad8281149c7049d7f10e9eddb147e5
font_01_sfnt_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 14324 bytes
SHA-256: d2c348ef7b60b0bc6c6ff1c76e1675233f5117f704814efb0c73ac5a2eae4410
font_02_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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