Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd710ff18c7a4b73…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 07:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b24a369d1e41b551be8df4b30c85c11 SHA-1: 94d03c3fc34d23faf5701038c249537d8d718c14 SHA-256: bd710ff18c7a4b73c9a3c9799bb95306f2fdb8d10962b5a3b4a3027729803ae1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as an initial attack vector.

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 http://mobitransjogja.com/files/betujagegetudobemewe.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adc225cedd---rolasimefiwesun.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85985083185.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/davajibutomasavarurelupid.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/26759659710.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3o9tfhb450hokqcd27rgflkha3/jexemesijovexiki.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/sujubodunevedebosokipo.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/xanivuregoref.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/zevaduku.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/buvopunepitadugizixenufam.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613961930791a---jabefana.pdfIn PDF document text
    • https://epiphanych.com/images/file/bezexapanux.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_8393_634.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/renivux.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/8210697290.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/tuvoxusezun.pdfIn PDF document text
    • http://pronobile.com/catalog/file/xuxigejekivabu.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/85799136250.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/10270710766.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/67029901799.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/jejalezegenip.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/75429564238.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca72d706d---56831254424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=all+naming+reaction+of+class+12+pdfPDF link annotation
    • 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 17800 bytes
SHA-256: 0b6780f56b751d33570c019d9c28be743bf37dd0771d7492d0710e07ee1b63b0
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 11116 bytes
SHA-256: cd9b779a9738d75253d009513c39a18a3f500bbb7efc3de3ee986a095558443b
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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