Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d2bb3b4844602…

MALICIOUS

PDF

96.6 KB Created: 2021-08-06 00:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f294b10c0c9594ff592096a6d023398 SHA-1: e611b5d727ce4b070d59403358c592d4cc2ed78e SHA-256: 310d2bb3b4844602a4b9d3cd2c82c4e0fb8d9f87c301afd3222377d0e6b327fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a link farm for SEO manipulation or to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://htwy.com/upload/file/72525334606.pdf In PDF document text
    • http://dfh-consulting.com/userfiles/file/fuxaluwuxodor.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/mowomumisorozakofopomit.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8e9a29f2---73604365388.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16085047fbfa0c---wexopagowegi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b785c5ff70074c20406cdf350b506ef7/85309610195.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/ede145c7154db9b037541a29ee095147/54466659697.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lfng6ru6215v2uq1i3e9sngmk7/lukudikaxunorup.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa479c61c6f---wifobemewubevufuwaruji.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/mojebonelojuj.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/64977395167.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/3602708451.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zemiwax.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/jovuzekunowuj.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df0015be40---mojapunomibozibimimopenal.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/bebojoxu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc8d2b194a---96082743514.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160910e756f94e---20027681310.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/94076646117.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/powozawareluvikovipe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/198vdlda5iroo6r6r3lmljs2ct/49571481272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=interview+questions+and+answers+on+bootstrapPDF 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_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 17792 bytes
SHA-256: fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
font_02_sfnt_off00015b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1D 10828 bytes
SHA-256: 600e1d4a17ed5a47ee5f01eac12ee12dcbc5ca1ab12fdd0d9d12217bf3079b9b

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