Malicious PDF — malware analysis report

Static analysis result for SHA-256 646f3db5ba9c81be…

MALICIOUS

PDF

106.3 KB Created: 2021-07-06 15:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13096e3cd4a270c9fe2b375eb8d28b54 SHA-1: d389727a7d84a876bc8bb20bd953ba76d7b4519e SHA-256: 646f3db5ba9c81be81bcdc99cae70b49a21ac31285de6232b83cb8cda6a6d03b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://ibtaker.ps/userfiles/file/wuwusow.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/2632955578.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2650d1caf---34369833463.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/65787938510.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160944017ef20e---47173215515.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f9d1d48a0b45a4ccb3f5a488b5daba07/peribijov.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/38871091701.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c0611bff4---6898714450.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608add24325a6---16091955956.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210626094342.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff00a62fc1---budalobagajudop.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/90811952621.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b47ad71919a6a310ded85b9b3f2f203/30287794752.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a650ea169e---31276011384.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/toff9265lo4d0j64s7o07qfbhn/najorokosagu.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210602185212.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b4ad2e5e0e9308b2d06becff3a767061/nakelawusid.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/kiwefogemajotirapas.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/gedajuzelabifezi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xigenorolikatogasikerevez.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50a2aa92e---31924037923.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0237f09709dcaac242a0932a10a88f5f/rilariv.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/42049201313.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lepolit.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r09cvi4n926qacll5nq4sh29q3/finikokeketezufagabi.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/48392018740.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/040e357db365b6ab577b30919be0a629/wapumola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aretha+franklin+and+ray+charlesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/53c47e423c76576cdb9ae3d90619af31/kiwebiw.pdfIn PDF document text
    • 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_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 18560 bytes
SHA-256: 4ce412be8b386200ec37f3e2502bf1e10c6f545df9003971d7c90275668209d5
font_01_sfnt_off00016980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18197 10640 bytes
SHA-256: 520c6836483faa4499ab96156b799eb66990e3980aff77217068d0e7d6f96b1d

Open this report in the interactive analyzer, or submit your own file for analysis.