Malicious PDF — malware analysis report

Static analysis result for SHA-256 803cc50ebdbfe1dc…

MALICIOUS

PDF

98.5 KB Created: 2021-08-03 01:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d319742870d8649de58fcaed0f66480c SHA-1: 16f9bb64cd2a64edde705d9f3568e08db33d8321 SHA-256: 803cc50ebdbfe1dc1482c5837c61eeca2a9239847377ca09448bedfd1cce19c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs point to various compromised domains, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 6

  • 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.
  • 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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160768671c8be0---59985036273.pdf In PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/wadorifakafojofezewomos.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/logatijoduvedugetuk.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9a3ea0c0---79826284774.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770fe85e7da---guteruritejadevomu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/55303660795.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608473b51004c---likebovanetulododinuwuva.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/7022729555.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/68882812904.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vakixepoxagegusulexa.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4689f71fd7f04a6f6609217f3ad66879/59993554481.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/23724442317.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210718091343_8ybn5v.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4a89a08420c30abcd4214bd3e5ac9068/83814886618.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/84026903262.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/mopubumabilidozo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/20c6e65b0a2bdcbf8fc48ac152981f63/38681783355.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b897adc4cd---71371799992.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/02/file/50994632740.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/xukolu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ki2pagm7cm71pvcq4kfufstgh1/buzokasa.pdfIn PDF document text
    • http://2440027.ru/upload/file/fulejetegorafuvukizagawol.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5169f1c92---23647717837.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/6124020806.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/17b07a46f804b69deaf004fb3fdb1e6c/vusokivawutitezufelez.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2dfda2f1---54393371198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=madina+book+1+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 18336 bytes
SHA-256: c7da5af4001e0f6590ca4ad67398bc3b2d45d0d5b820b2808c18ae861de9827d
font_02_sfnt_off0001451e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451E 10588 bytes
SHA-256: 28b62ab6675c105299c96f561e85e0931c0292ed4777aa867740cef146e6daac
font_03_sfnt_off00015d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D31 18144 bytes
SHA-256: c170d5703febe08368ffaadf0b782ac770dfd117a930d4cda7c50b0582b91ab8