Malicious PDF — malware analysis report

Static analysis result for SHA-256 99690f26618b9d2a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 13:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe60729808231d47bf82d8993e11a2e1 SHA-1: 7975feddaf07765ac06c1c1c2cec84eebb7c0f97 SHA-256: 99690f26618b9d2a1e0d12dd248a5f49f27c0f07ca33c45c9b244120da73dc4d
104 Risk Score

Malware Insights

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

This PDF file contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised WordPress sites. The presence of a link farm on disposable hosting and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The embedded JavaScript likely facilitates the execution of further malicious actions or the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=global+recession+2008+pdf PDF link annotation
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/d55ms0dbtk82sei79q25jc0f34/kepuwofetawimidenotif.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/42523748173.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/5197959556.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/tosag.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/suwigefovamevoto.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6568b4a1d0675bb919f3e03bf77dfbfe/demusog.pdfIn PDF document text
    • https://webmenuplus.com/images/file/69075353197.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/mawibiwov.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5107f5753a---81514999570.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/62919428535.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/11551099574.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/17344639806.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/91728312723.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/sowanokuj.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fddbf968---10362138207.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/62475338994.pdfIn PDF document text
    • https://tomas-music.com/contents//files/pumuxadidofakavuri.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/sulurukabodapobapebisinup.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d85874f4bc---56700611061.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/65590655868.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/46397821212.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084307e1c0e0---zegenofumi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/bab5796d0322c619f1749e8d09b40433/nonolewe.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/25481a494477187f81c5066401692036/virefaromavefejevowelimo.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_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 17752 bytes
SHA-256: 0bfcac76065463eaa2aee5294ad94200419d1135f359f877c6535832f35e19f3
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 11144 bytes
SHA-256: 7c71a5c39fd3740c39e634cf0a97d74ea5c8a6106a81bef3e18275eaeae5158c
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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