Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f546c9780991c9e…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 09:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b52f1a353fff879e4fc19650118cd2b SHA-1: 2bb0d06f01499623b3c31b23e26d8a1985f76c74 SHA-256: 7f546c9780991c9e2f52581d9598e83798d61da93e321668f366e724b40cbc93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics suggest it functions as a link farm, directing users to potentially compromised websites or disposable hosting, which is a common tactic for distributing malware or conducting phishing campaigns. Although no scripts were explicitly extracted, the presence of numerous embedded URLs and the 'SE_INVOICE_LURE' heuristic strongly suggest the document's purpose is to trick the user into clicking a malicious link, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lncxjzxxw.com/upload_fck/file/2021-6-13/20210613095738458830.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5360a489---sivixofopoxiwaliwe.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/4eb46f912e08af29bc9102248607b752/4749731354.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vja1od8fhq9l13qs44hmhc7o11/pewok.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/fuwomelipapozagupibipu.pdf
    • https://btegypt.comfile/69095298473.pdf
    • http://sosnovgeo.ru/userfiles/file/gejudas.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f68db436---nasobudedavimepipalojil.pdf
    • http://liddellgaryfamily.com/clients/863293/File/newat.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t64i87v70j1dt4dp8h4rqvb862/wodegofolelafivorinenagu.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad413406af---71401987660.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9dced393d20c3cc1629564c5f792f297/zidajewadinupulu.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85fb29510---30478248736.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7471cbc5f9f340c3da26d0f20cd62929/24317374086.pdf
    • https://mides.vn/images/ckeditor/files/babeferopodujulupugika.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/44468cb0c95c3ff3a5ccd06c22870e8a/79299844488.pdf
    • https://psychologgia.pl/Upload/file/28526853030.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda048acc7c---dukabunitozegubodenidupo.pdf
    • http://spreewaldatelier.de/img/editor/file/28050613526.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/302bdec85716efea957c2cfaeeaedf71/60844093476.pdf
    • https://aradmissions.com/ci/userfiles/files/57169138872.pdf
    • http://anpo.vn/upload/files/loribedepidiwided.pdf
    • http://amctop.com/board_data/editor_img/file/202105132229.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cf8c43d1a31d6ed2f46c240fb2920287/22100146114.pdf
    • http://gotween.com/userfiles/file///gipobanotewozutofu.pdf
    • http://septumdent.com/img/userfiles/files/26540120581.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/bhmjn0a89v21cma2gnpkc1a4mu/lulesafavupetobotenakefid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=constant+contact+user+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f654.bin
6012d934a7d3d64f4198d989cf07b91f9154d1d28887298109fc245538157c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 18124 bytes
font_01_sfnt_off00012618.bin
107b4609e083cfd466f07a11c9234b310775ebf0cc270ffeb89925f7e1957d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 10432 bytes
font_02_sfnt_off00013dd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 16792 bytes

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