Malicious PDF — malware analysis report

Static analysis result for SHA-256 353f5d1da5dfc039…

MALICIOUS

PDF

104.7 KB Created: 2021-08-13 15:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ba2ee51cc0092b5cee5a893243d2340 SHA-1: e0e6b370ba86bc86e7487674847efd970b0e5932 SHA-256: 353f5d1da5dfc0393cc32b973f16d07d64138c027598bf1a84d75a08ff4c68aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The presence of URLs like 'https://queure.ru/uplcv?utm_term=sony+playstation+ps2+games+free+download' indicates a lure for users seeking free game downloads, likely leading to phishing or malware. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=sony+playstation+ps2+games+free+download
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd17fab0e2---24038532700.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1aade071---56885228476.pdf
    • http://kalmi.ru/upfiles/files/23249355174.pdf
    • https://adsbudget.net/userfiles/file/rodizuruz.pdf
    • http://castanienfamily.com/clients/74558/File/95599189732.pdf
    • http://iseveranscopy.com/upload/editor/file/zinaresi.pdf
    • http://skupka23.ru/upload/m/wozutez.pdf
    • http://geobigoni.it/userfiles/files/12703047642.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/voxukirunisarudek.pdf
    • http://jeanthompson.nl/ckfinder/userfiles/files/7388959337.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0339te5opb05hd4k4kcpfv0e30/83311948458.pdf
    • https://bandai-k.com/userfiles/file/20765885592.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8843e1731171163dc8e236bacd1e6111/69721118797.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/509q8rh5u3i2k8rrj9mduanquo/saneb.pdf
    • http://qiuyutv.com/userfiles/files/20210704015300.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e522263dc---88597861616.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/57047744551.pdf
    • http://logo4you.dk/userfiles/file/34748612345.pdf
    • http://studiopignotti.it/userfiles/files/wanaxu.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a69792587---82760925669.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdf
    • https://paklya.su/design/img/upload/file/kimotulusad.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071efce25587.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/xemezenodobedirudasegow.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/be5f055cb421eb5ffd4ba0e92477c6fb/rokexesemifevesulikub.pdf
    • http://mobydick-band.de/fckdata/file/22119770430.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001234b.bin
475c6d57bcf1e689984f9ff1d8281d524b4796e8bf58cc2b783a3c792144f299
pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 19708 bytes
font_01_sfnt_off000155cc.bin
c3a198899e46ea38344c6e1785b6968979ac73c67d8b2d6ee8f21073c8a97c32
pdf-font-stream PDF embedded font (sfnt) at offset 0x155CC 2952 bytes
font_02_sfnt_off000161fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161FD 16792 bytes
font_03_sfnt_off00017a14.bin
d9cc8bfcc8ac154df68290510d734c170a4f1544b8a4db171d81119bf49fb3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A14 11236 bytes