Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eb91e7abbe3d9a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 03:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a8ae90227d69ba574e2b884cf748144 SHA-1: 4c2e8167f0defdd03ce1a68babe4a9567516c3a0 SHA-256: 77eb91e7abbe3d9acd1b121c6b6b1c3b7d33c1af95ca6b267a221793220a91c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=50+shades+of+grey+pdf+free PDF link annotation
    • http://mygotour.com/FileData/ckfinder/files/20210901_3C8D6289BA21F6CF.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kigujug.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sowewureda.pdfIn PDF document text
    • http://imaginove.eu/data/Files/33738733866.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/72072549218.pdfIn PDF document text
    • https://blokhol.com/upload/files/69244512537.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316c920bdf4---nikofisibavoxuredazorej.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/58968121429.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/dadilumivazujutekumate.pdfIn PDF document text
    • https://onecre.com/images/content/files/85827818339.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335a544c6e0---diziroxenipulesazoviwa.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/65373393566.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210902075720.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/wexajajapivitekexokajal.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139406e32a5d---gixiji.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/rafamixikoj.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909070724434396.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/96951653119.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/kalenab.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/gikekasizalaj.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/zinali.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea1fe0e11---51655714135.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210901/file/rukatazu.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/89634609110.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xotukoramar.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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 17472 bytes
SHA-256: 0a7bc2b86cfa22dba4db1f8c49e8b53265ff74c083e64cffe84a047a61ea36cf
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 10708 bytes
SHA-256: 5e6a20d5b6a4c951446f3daff36a0f6ee68a5e861e088b6a37c76067743d47d0

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