Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c433ad92ef8224…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 08:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 950a673aa710ba77a2826149c9f387e9 SHA-1: 31b386a30fbec3784a06e8f728ce48d1eb89df49 SHA-256: d1c433ad92ef82247d6c61ef5df41c161e1d536bd9d5fb82d32712257a2db45c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The presence of external URIs and links to potentially malicious content suggests the document is designed to redirect users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=http+injector+pro+apk+latest+version
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0981a1a09---segexinu.pdf
    • https://maciejabramowicz.pl/upload/files/file/98997577316.pdf
    • https://aitalk.vn/upload/files/juwew.pdf
    • https://pmfegypt.com/userfiles/files/67261591868.pdf
    • https://mygrind.ie/userfiles/file/fidomuv.pdf
    • https://kaowei.tw/image/files/20210909_095145.pdf
    • https://derechosenred.org/aym_image/files/guxufofopofipaw.pdf
    • https://magnanelli.com/userfiles/file/65829556454.pdf
    • https://es21sys.com/userfiles/file/49789440417.pdf
    • https://n-v-v.dk/userfiles/file/bizodumeberojenozazo.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4a7195fb6a0cffb9304bf0844f9b07cf/48997948005.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8001e41b360473ca7c7ce5f7df5bb777/didutupifirizifitog.pdf
    • https://haysalon.com/public_html/userfiles/file/fasebikixenovit.pdf
    • http://saothienemb.com/uploads/images/files/76682208332.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a17690ad---20054376893.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/25712359840.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b5da29f749e16f2c62f860e6669a3bbf/71642618322.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469af4246c4---57958026455.pdf
    • https://crcnueva.naturasoftware.com/uploads/images/files/34459269215.pdf
    • https://fsreloading.com/userfiles/files/46560798714.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/18862293531.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f4a0cf5ec0bba47649443e939f0274dc/78713006979.pdf
    • http://hvezda-pardubice.cz/files/file/8634170215.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e5.bin
61b0fba494efd560d5d113866a99b7d804841923446383ad5111bafff647b829
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 10644 bytes
font_01_sfnt_off0000ee55.bin
15865355bde1e9fc9c39ef89594bf3688d9602816c558d13736d35c09cfa1f09
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 18624 bytes
font_02_sfnt_off00011ef4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16792 bytes