Malicious PDF — malware analysis report

Static analysis result for SHA-256 0858ba7fdecea6f4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 13:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83509229743dc283da18bb09a1ecad96 SHA-1: b1953ed6540a3e060f30852ed6b3d2f5c733f7b5 SHA-256: 0858ba7fdecea6f4eb5f283b9baabff0639ffd3958cd5a3db36423d89ad5b952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075879039807---monurepovamisoruw.pdf
    • http://qiangka.com/ckfinder/userfiles/files/xenifoluwudubudekoponipo.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611522479b169---34320948766.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/b000c24j6n8231kjpic7h2tb7d/surunolelurokigenegiwi.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/xudogojalulosa.pdf
    • http://cestovni-postylka.eu/userfiles/file/sepojaganefezugolitagavid.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/58696088887.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/kupofesodufok.pdf
    • http://asiavent.com/UserFiles/file///bisisuwuduwijamokujar.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ff2759dd---58162533231.pdf
    • https://rugsinc.in/UserFiles/files/sogufawunosap.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/3564808368.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c133b4b450---xugagotenez.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160965515d7432---64030729432.pdf
    • https://lawyerupsmart.com/tempimg/file/51465933680.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ee685720---nenasomuga.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f28ee3d24---feronunipamezofeduwinufi.pdf
    • https://mehreganimaging.ir/images/upload/files/32302517743.pdf
    • http://summitremodelinginc.com/userfiles/files/talifabimanubeludakemidef.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610747164c730---fijajopixawag.pdf
    • http://heyumpnd.com/userfiles/file///vitojejakobom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=online+education+ppt+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_off0000e53d.bin
87bc344a54ebb9a539d3bbe25f41bba7a78e033d872293c2cf5917e52c13dd76
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 17672 bytes
font_01_sfnt_off0001129b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 16792 bytes
font_02_sfnt_off00012ab2.bin
219c8319b8af327cef4368fc263bab4555d10cd294aa2b2e7f6c2060ab6097ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 10468 bytes