Malicious PDF — malware analysis report

Static analysis result for SHA-256 4078f9541f21783b…

MALICIOUS

PDF

84.1 KB Created: 2021-08-09 18:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30a44250275d57a9744225716b4e1126 SHA-1: 878a150b9075fdc291adf0c7560d58cda3e38622 SHA-256: 4078f9541f21783b894b98296a3cdc62c02cf2a1c549e44365a1a073c93a793d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=paypal+cash+card' in one URL indicates a potential phishing lure related to financial services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://allytemp.ru/uplcv?utm_term=paypal+cash+card PDF link annotation
    • http://sbox-technology.com/upload/datoteke/mipep.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/pujajamokabepaki.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29048397224.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/84579149689.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5n5s87knrfqc0oc3la08cplraa/foxuzajetovesuwenodif.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/wigukomoroxebegixejas.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5d65ae38---nipupoxowa.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/vamasaguwofox.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/wejininax.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bec2039c814---ranosuzovuwazeleluda.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbec7832fb---88548619427.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cef69c1bcf---kegesumebijumiremenudoka.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/1314643945.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aed2ae0f44b---13233541568.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f918f0ba1904b3303dc704601dedba45/25512766235.pdfIn PDF document text
    • https://ms02bet.net/contents//files/jajud.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/53415586490.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/seligutu.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021522054302749.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/72480157210.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/22330069147.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/14839758256.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/d8b1o0c90106514e18gndavm7h/neludizavajaxepisuxitawo.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/rodesutekusu.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/8911050279.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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17720 bytes
SHA-256: 4742c76fa48656aef05636b8ab58c25df4b551f19fb571a542a2538942acb3df
font_02_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 10180 bytes
SHA-256: 227dc705af2ceb111d10afd6e6f0e8ff40dbd4f3ccaf5a0114df12007f8c9923

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