Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2fe2300a5148da…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 20:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 169f0f217719c9269ce8b8973d1622fa SHA-1: 3bcadadd964b59cc369399a52bfcbc9b01e852c1 SHA-256: ef2fe2300a5148da2416cd394a662ce328bb54c1d0302287cf7093688da009af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV with a signature indicating a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3866

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://hani-bee.com/userfiles/files/biwerapowi.pdf In PDF document text
    • http://china-miyaco.com/img/file/202181942837.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/donasikujoguridofosi.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/tusunonobozikite.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/perinaxogozute.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/57959844537.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798c5ca3222---bafanerunilokunojulezuji.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/79598344181.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d6ad347d5---26885511072.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/42988191764.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/somod.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/binapibifodekufebo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160912ea3c5a8c---16929364564.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3abdbf08a---57054984980.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b1e161d0e8e3f05522689e0f48a18a4/jeninubokuzi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/88618ef3480ddccaef62f773b6727c66/31546351272.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be37e7573bb---72645939166.pdfIn PDF document text
    • http://surtek.biz/image/files/20150117_235940.pdfIn PDF document text
    • http://enricobarraco.com/files/sisorovavu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b8ee0c1f6811c64be1810bdec558f868/walulekir.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zededar.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jexugoxowax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=svt+terminale+s+g%C3%A9n%C3%A9tique+exercices+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 20284 bytes
SHA-256: 13bc83c66760e6dac22b6a6038bfb05fe2df4b4c14129745bb127fe27ec42b92
font_01_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 11488 bytes
SHA-256: d79409f4371b3a198fd395170208a1b0d415a3f1200fd61d04b277db16538320
font_02_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1