Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf128040320beab4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 16:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3e29a73a8da32719ca19855b722d391 SHA-1: baccfb403b0688609238850141658503a34f0f61 SHA-256: bf128040320beab4a79a92f151d4a7f341a4b31c5f0128427fe20ec039e61a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the presence of multiple external URIs suggests the primary attack vector involves redirecting the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=internment+samira+ahmed+pdf PDF link annotation
    • http://chikatere.com/Upload/files/43755813805.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/balifotakugozutesu.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/54490207972.pdfIn PDF document text
    • http://huntland.hu/upload/file/75260969775.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3d1e67fc---69746290922.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/48thlq7k99r05fp6p03j1klj8l/gesep.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e028091333---15716077554.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/45426861251.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/lopazudifekiwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ffa714a70---85130929859.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/22408666116.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/juzavutetiv.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16117e6fd29151---17632819867.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1b1381455c8b48f161fe250a946ece83/jekegonepikubewuwup.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210812200736.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/36039905052.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083728a9fc15---fekizojuzurogemulasijaw.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edf37f6d2f4---98414941664.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/70625042046.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/2225803354.pdfIn PDF document text
    • https://yuh-tarng.com/userfiles/file/jasuj.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/mupamatuvolafemogapuru.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/todipivurewivorov.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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 18804 bytes
SHA-256: c670eeaa323e6b113353a7f034220dd6088ac7bd7e9906ce9cd451ac69f9006e
font_01_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 10548 bytes
SHA-256: 3dec69a150417cf4ab646172ecceae2105238810e7e4840a611841428dc96f5c

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