Malicious PDF — malware analysis report

Static analysis result for SHA-256 d293d2f135ce243a…

MALICIOUS

PDF

79.7 KB Created: 2021-08-15 07:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b3ebff88558ddd966868a98c7feb6c2 SHA-1: 5d20c5734830d6b00880b400152286d51522a4af SHA-256: d293d2f135ce243a73fa5f8906700c888867767ef688a51521e3ae272fceee5c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://etonbio.com/newsLetters/images/file/sebukaxaredoj.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0a5e2c458b58591185165362b6c0f969/xaxuminetebif.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/zupinobizobufi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe50b48cf07---lipozopalumuzisemokij.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/08c105ca4d195ad4ccfb6a94fca79fb4/52417659704.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfcf83980---pizeletika.pdfIn PDF document text
    • http://stylekd.ru/files/60450475004.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/puvumavivananagoguzopab.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/668b2cfb82f76f5e0f968854aff1dfad/jolorusivevepaxatap.pdfIn PDF document text
    • http://azizolace.cz/images/file/nudozedusufitawuxupogo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889a9e26188---76125266953.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ragpbugf04f5vved7ufhfobjs0/rikimez.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/18544647029.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6c6955585eb107115299a2ffdf2027fb/bavogeg.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/66313695247.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/filexotifagotuvorelugod.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/81182520837.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/pipalav.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/96641024577.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/747ccca285c75d4db7e02cdc9037e898/32035994556.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3fc19c4a84d7b93baa1d261df4e11496/nuzatofaluza.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b70433b3a---vujapulipasejovofek.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/60034943136.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/co3sauj2ut6b2obgbk2blajr5i/13293560208.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2b520c86edc1535cb50420137d346bc6/73078269008.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83757b7ed---5372935636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=run+on+sentence+practice+4th+gradePDF 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_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 16096 bytes
SHA-256: 8ab074eff7f0c2710dd1e1710b126a6ea0859a04a431224e30c5c5c765a8b267
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 10972 bytes
SHA-256: 00b0d3b37e1042abf3a82beb38c340e70b516db172cf2837a77ef5fd5e78e41f

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