Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c51aeee593d9dfd…

MALICIOUS

PDF

87.9 KB Created: 2021-08-14 17:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df1a5ce253290c160156d40df621c593 SHA-1: d9af1da445700f33b6072088271f3a335f849848 SHA-256: 8c51aeee593d9dfd5e12c016d34111becfdb9017c8beb780a128d797d1b53db4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to external sites. The presence of numerous embedded URLs, many hosted on compromised WordPress sites, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fdae0384---wetebeduronafabamuxuxasar.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64c0d23cf---jerijaxilisikarug.pdfIn PDF document text
    • https://udruga-invalida.hr/files/bapepadobunonepatu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c43fb17f108---20969618486.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28d44e5040---86126178649.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/fupozisope.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7097e6bb5231d0b0449e8492781d3e6d/86074485715.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eca127cef97---kowewagudijuni.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/53197373ad0beaba13b5369ea33f7a9d/76350482988.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/62158022446.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/12539342370.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/12185188023.pdfIn PDF document text
    • https://activepymes.com/pub/file/nibamimok.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/jafugujevadu.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/4197bc6f37bc570c0fb687582f4f174c/79858855726.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611067d24ffad---xoxat.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160861be1c4bd7---sokanesijuvurugoli.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210731_074600.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/56360699449.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/93402481653.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/xekirenisogakubepo.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/rudip.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bq7omjfug8g5qeptedud3srbg3/vuxawagewisowisosi.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/babemilovom.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98526d2492---17743909356.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/21278822315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ver+pelicula+completa+recien+casados+con+jaime+camilPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10876 bytes
SHA-256: d4cbdc4a2453682a0df63620dcc4a56e043d9b3708949d1ce6845878942c3595
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 17764 bytes
SHA-256: 246c1363145374e22bdee1ce8cbfecb0977b850e59fbf520a8b100b36f5ac2be
font_02_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1