Malicious PDF — malware analysis report

Static analysis result for SHA-256 5006b7316f2c4a0e…

MALICIOUS

PDF

85.1 KB Created: 2021-08-09 00:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d92ffad267f0671bbd2df45d2bae27c SHA-1: 1e476c0c047eef196e54d82a11217470838558bc SHA-256: 5006b7316f2c4a0efc9dc0de102984fc2735584e8427aa4d1422d0877e5f9f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised WordPress sites or disposable domains. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content, such as phishing pages or malware download sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=o+level+chemistry+topical+questions+and+answers PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0627f609bb---72692672711.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/virizebavazizuvifuji.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/jexem.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/339777637.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jixuwasegof.pdfIn PDF document text
    • https://bursac.net/userfiles/file/9668563844.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/83317019147.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/50342962799.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a7f8cc43acae7d0142c215654f4c62e/70967058016.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/87426134799.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/vozuxosivowijodak.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e23a5cbc2c8---70792561963.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/93770726695.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/rojawufezajum.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd4e5f038---jipinopidob.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af17a08aae---fisejuvojazip.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/38089872209.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/42ffba4778ec5b03769fc08e1806c96c/14049011815.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/pudavusutekemumimukam.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/91d4f42e5019e9cd650a42366f586976/pelekunivusikulifiwovef.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed6253786---zelutubalulajipibefet.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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 18004 bytes
SHA-256: 88b722ddf377dfc90d708292539ea17b8d6ba636c6162273bd9763af5cd32390
font_01_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 11316 bytes
SHA-256: e44bfb520a936784135f8482f3f105a25cbe3d29b3efc2fc1e756e6f140bd36e

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