Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f02d57e5bf57a06…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 12:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56fbb927d47d5861c6b4f2cda628d72b SHA-1: dcf2558ee7aad71df61a80b0375b82d99ae83dc3 SHA-256: 7f02d57e5bf57a0652432604dd579cd4f16237897a55b3e2e08596dcdffadca1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of using documents as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=the+crew+2+mobile+apk
    • http://mrs-edu.com/sribati/editor/uploadfiles/51074394798.pdf
    • http://dydlhx.com/upfiles/file///vobebexokakasa.pdf
    • https://kozlovka.mebel18.com/uploads/files/82145410538.pdf
    • http://jshtextile.com/UserFiles/file///sadip.pdf
    • http://studiopetrilli.it/userfiles/files/41388430314.pdf
    • http://owv-sad.de/userfiles/files/gokunosowebanedeko.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613565bd52da4---betituxeratenoxumaveru.pdf
    • http://ndt-ultratech.com/files/pufimegupaxik.pdf
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/mademenagaxo.pdf
    • http://yuanjiangchem.com/upload/files/94835205796.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410637857ad---89898553634.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e45534a10---89261500794.pdf
    • https://rkdestate.com/userfiles/file/36716011985.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/67654824980.pdf
    • https://butchercurnow.com/img/shop/contents/tinabelanowurawirazudara.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/lugumixe.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7d271862---90034517589.pdf
    • http://geonatlife.es/ckfinder/userfiles/files/77664824931.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/47077275261.pdf
    • http://frezerovka.by/images/fxeditor/file/liket.pdf
    • http://snieznik.pl/userfiles/file/80551915571.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/42130081176.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/zisifivesel.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_off0000c93f.bin
e78e6765abfd68a6542c19f486ccc5976b15ddc43ee613f2b1e85e1c42dab5c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 17684 bytes
font_01_sfnt_off0000f6e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
font_02_sfnt_off00010efa.bin
ea6afa8e2a4d409fb05863606414ab64507fcfa6a088c2f4664e49077660aeea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 10668 bytes

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