Malicious PDF — malware analysis report

Static analysis result for SHA-256 3807accf7d13b017…

MALICIOUS

PDF

75.1 KB Created: 2021-06-26 02:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7dcfdeba05434eabc51b3b071b6c5a99 SHA-1: b738c0e9db5235720b4d21f057e5ed32889c4058 SHA-256: 3807accf7d13b0176f9f9d6e4516dbc2dc28405fc0f83e9ecfa666f56e6c8bea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/7a0227dffcbd594c4af1642b4188e109/zodajutakemigudezokini.pdf In PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ek57kejl4epmokojlnc0oj0ilt/togubegezaneburomu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1b4c1472---30340070461.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/96976498983.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/gixakoxitedar.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f1fae865b01d7c2993b904415b836776/bavevatusekan.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac49e0efcce---rubojufo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e9ca0fa44---fovemanewozuno.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8eaf5c631---30417044069.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/91127825211.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/petemofexulaluxapo.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/woporajujaroborom.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/genifup.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/55da26ff989f1adce5171b3389b43b52/xevutozedibajorawewid.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e99c769d610a0f6372e4b6b429e90887/35186565138.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/kibijatapuwagozukexuj.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607651b701a87---latoba.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/2466245526.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/kisosebotipanifudemakib.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70e8jboisj9fr9cs7e7m79tpo0/jomixovodewiz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e3cc8eac---kidivowifotedonor.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b8e03b47b0466aa653eed4ef7d51c173/fipufona.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/64fa9e706c4e1f66df0a97013b93d4ee/52063946216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=adairville+city+hallPDF 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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 16704 bytes
SHA-256: 5ff57aff9f2aa20870128e6f1acf842102cd26720be1e94f757a5176d2de6c60
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 10236 bytes
SHA-256: 1e875d6814296e56a4cd3dacade9879b12fbb2ebfcd7f01b07e69fe5e361a5bb
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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