Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cef91cf0efdb531…

MALICIOUS

PDF

115.5 KB Created: 2021-07-08 11:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a5c7f3b0cfa72e537fe4cd3fd72acc28 SHA-1: 3b97c40c87aae3b02a5d4f20176e3fc2f84abf1e SHA-256: 7cef91cf0efdb53123114696e76d44fb4984e042b3b65feff359f26674c25062
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://clifestyle.net/uploades/userfiles/file/37827409261.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0929134e01---83719321604.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4a238ba5---joguti.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/kuwiwegugubi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff22269d1---suleraxijitabisinul.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9f76dbf88---kilikebipitepinotonevejul.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210515175359163.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/20113632535.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9917b442b---jakosaguda.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c4e63c05bd56954a69528f9babfcf8f9/20962665357.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/wivuzobodiwewegobegigi.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/risekugataxumesamadodex.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608631a4ba909---gajafuvobokasefev.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430015917551141.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8f926f6a9bfa9045edb0de07a7325177/14755182297.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/vilixakemawepitu.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/31694408065.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/falosopaloz.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5a6926147687d7b880d415a6b5eb708e/62808901131.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/42657948494.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160db4eaad9326---83134643539.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/28050981014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=saturated+fat+in+chicken+breastPDF 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_off000164e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFE 10812 bytes
SHA-256: f83fa43cf636df59c57087468321ff09f627939c18558e5a1a36a144310e033d
font_02_sfnt_off000195d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195D2 16424 bytes
SHA-256: 0dd282b724e127b551a99de5452bd05b97f4a9e532b7e28a1fc55133bdd80cd7

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