Malicious PDF — malware analysis report

Static analysis result for SHA-256 907f60135eda17b6…

MALICIOUS

PDF

96.9 KB Created: 2021-09-19 15:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8169408d07d79787d1d9644cdd77bff6 SHA-1: 1deee186af1c3aba359ee870e9512d8ae5f5294f SHA-256: 907f60135eda17b690b08ca839cb940c941fccc7ca7d81003665f350584085e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, a common tactic for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mygrind.ie/userfiles/file/wutatojexemibit.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/kotasug.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614596aadbb4d---polufipow.pdf
    • https://preciseenergygroup.com/media/50456174791.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2a89297dba7b6760d2243ce7fb6f4232/sajawepagemosapasop.pdf
    • http://j-club.eu/userfiles/file/48513136.pdf
    • https://revive.fashion/upload/files/65823396816.pdf
    • https://sapporomn.com/userfiles/files/30710565147.pdf
    • http://cdio.vn/uploads/userfiles/file/xurugakakur.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cfe3b119758f179c6d6c6a413af6f7ba/kexegixebile.pdf
    • https://dom4m.by/userfiles/files/xadedojazatokomazuxe.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d2f531b2---pujaki.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/86142482030.pdf
    • https://matfplayer.com/calisma2/files/uploads/binarusadazuvozuzesororov.pdf
    • http://all4pets.cz/ckfinder/userfiles/files/wupemebiradut.pdf
    • https://naves.cz/res/file/nevulas.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/be9492ade797bb6381cff1bb29f9b726/77614102714.pdf
    • https://venusnvs.com/userfiles/file/70267468125.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/kedon.pdf
    • http://onlinetradeshow.ir/uploads/files/54489067562.pdf
    • https://ketdoanbus.com/webroot/img/files/manuxunimawasuduvumod.pdf
    • https://123natura.com/stockages/files/dofenitenerur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bazaar+for+android+4
    • 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_off00010317.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 16792 bytes
font_01_sfnt_off00011b2e.bin
05919aeb04d4b982f52da25cf7d1291fd61f185ffe740a43b17f68746908e06c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 10096 bytes
font_02_sfnt_off000131cd.bin
54707bb35b5afdf8121d33aaa095460f55137bb72950fc94d9f2a03255c6dd4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 27596 bytes