Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fd98e5c1e3b153…

MALICIOUS

PDF

84.1 KB Created: 2021-07-20 00:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fa20b2a9ffd5a6401303ff445bc18f39 SHA-1: f53120d28eb1f827105c14f279326e828c7798b9 SHA-256: 94fd98e5c1e3b15356b293548c543dd0f93ea5e577ff0f5cec1a93ba9e03450c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://edu-family72.ru/content/images/uploads/file/18067905524.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zareguviselowepuze.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/2045347055.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/14823688630.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/agdgo5q95s083m7hb7dtgbht6j/mezawojavufazexojumukomud.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622793621.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/88595270348.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/borogedezufakagipubavaker.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210618055020_ncwdlc.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/92367028613.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/86466699486.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/59036902555.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/dimimunifujik.pdfIn PDF document text
    • https://stopserv.ru/files/file/62904747718.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/r6dakma5ii990it4sdg1pon53u/zolepajej.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48f4e9b224---73264695959.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8ef47e071fc20966473e338726cfd4df/butirivonipuxamokujezemed.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0da627592---75711697542.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/57310489994.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/rarajuwonurose.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d888024a65---5175089259.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d27e5b36b---53630269021.pdfIn PDF document text
    • http://come2menorca.com/images/file/56361166512.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/16971868727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=active+air+force+basesPDF 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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 16388 bytes
SHA-256: 1b2e001a660bd47facafe53b3dd9ff3fb0eb2591464576c37fa2a2f3d685b877
font_01_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 10368 bytes
SHA-256: 7f4c364efca1e533233f411d81083f02a5ff10899a5972a5524aa7ea80735e11
font_02_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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