Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ff853caf54162b…

MALICIOUS

PDF

93.6 KB Created: 2021-07-20 11:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9893cb45bed8096ac6941358845d1545 SHA-1: b02d437546f09c7ab7d17028030197685f800412 SHA-256: 34ff853caf54162b12ccbe2be800652c7e542d329910065df045d8e79d842dbe
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/55fbedac3a6d419cff859c173f26d13e/lutomimikopeji.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ov92ofj3udr1k4clujho20qls/36106968828.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ce095b67ee3---95316470009.pdf
    • http://kirilmazbardak.com/userfiles/file/mefujator.pdf
    • https://activepymes.com/pub/file/86654245458.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/441d4f92b4fd9211b67cd23094b8932f/6253159619.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6691bf4d2---34803342040.pdf
    • https://alakharia.com/public_html/userfiles/file/wijasinomusujifiravisaj.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ee67b0351---zupekilux.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c856f68718f---14413606601.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3081aff7100cecce607197b405e61bb4/fezebupufixedir.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2adbdf83---zabebiwadurawitozafo.pdf
    • http://okmarin.ru/userfiles/file/sugijofu.pdf
    • http://madiagranitosilano.it/userfiles/files/zidavuzukanojajelo.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/dcd3eb9e9dc63a5c1a72dd3135d325ef/musok.pdf
    • http://blessingsngo.in/userfiles/files/92085700102.pdf
    • http://lynhuagiasi.com/Images_upload/files/60524056641.pdf
    • http://ideatity.com/ckfinder/userfiles/files/64579805833.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/40765814739.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/kp1bp1mhkae0s7ec6c0unbocu4/29579894994.pdf
    • http://musorcentrum.hu/files/article/file/rafukexitoxelovife.pdf
    • http://cdwy028.com/uploadfile/file/20210523123351.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254d08a4cd---47243596460.pdf
    • http://kulturazebrak.cz/userfiles/42819227695.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+interview+questions+and+answers
    • 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_off000108f6.bin
4ffb81190596ef6209b19bc4b3e7541e908294c5c309a3d6440e7567ae62f8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 17848 bytes
font_01_sfnt_off000137da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 16792 bytes
font_02_sfnt_off00014ff1.bin
f0d0477429c2c464d51b6bf53e2de6b2e90cef129bb931a20cd05f1f2084a570
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF1 10804 bytes