Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aac4d0d4561a3d2…

MALICIOUS

PDF

78.0 KB Created: 2021-06-28 22:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6783e4c77fdc483b3e432e74bf5e856b SHA-1: 23ed0e66674eae9e0319e76c0a55b10ed3aba73c SHA-256: 6aac4d0d4561a3d29e6ab726069812d06d95b63ccfd63a6b21bf38ed771fd623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e34fe6bac684e72dce1fd263b65a1260/zesewafobebibegulat.pdf
    • http://bajcsidavidfoto.com/_user/file/dazibelalufunibopetidikel.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf4664e528---2675444255.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/2d03b1c6877ec4cb1e66af4a64a971b3/pigowifefo.pdf
    • http://logo4you.dk/userfiles/file/57557152265.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f194adc37---83941580404.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3hugpsjp02douhn75ffg6aruio/wefisigikemomejo.pdf
    • http://asckhn.com/acskhn/userfiles/file/88016491664.pdf
    • http://bdn10.cz/files/file/17794720119.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/kigefaf.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/51373231019.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad49151b4f---81811617298.pdf
    • http://acril.ru/ufiles/files/zokonunilerudefisamevosuf.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c9808ded5---39460870467.pdf
    • https://toskov-yordanov.com/userfiles/file/banafulejexutobuteliredis.pdf
    • http://visusmarble.com/images_upload/files/pipuvadaluzuxugazefoj.pdf
    • https://newtech-utm.pl/userfiles/file/30459542812.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4833a72b4---11131310753.pdf
    • http://www.bash.cl/media/file/72018068790.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/62f4860c606173b4e99b742f86246648/bajuwebojor.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095422d33be0---33758702518.pdf
    • http://sarlampa.ru/upload_picture/73680439754.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd876233e3---64994950591.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c48b6e62b0---79260582585.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/4413044c76393c38c36ec8e6fcfa5ccf/54686816609.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=katy+perry+ponytail
    • 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_off0000cd5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 16792 bytes
font_01_sfnt_off0000e56c.bin
fcfc0b48427c77641e2b01569b0dadf1f55b5e90bcc19fa4c5929fd6bc95c193
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 17604 bytes
font_02_sfnt_off000112a6.bin
c78b597fd8c24b58a4519d6c02700ad886251344a3d5d334dea96e277bee9200
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 10180 bytes