Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc145e571f92b109…

MALICIOUS

PDF

80.7 KB Created: 2021-08-18 03:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a98dac5cc5b8c2ac9a7a562e76eee146 SHA-1: 6434b3fc11ac9009edf9220bdd018ba103afc1c1 SHA-256: fc145e571f92b1098536b70ec4f29da2adb7cdd29f80793254bb3f0dda6bf8ab
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it is a phishing trojan. It contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics point towards an attempt to redirect users to malicious content hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://xn--dlek-5qa.com/admin/UserFiles/file/75928966956.pdf In PDF document text
    • http://chapelguild.com/images/usr/55672191499.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e0261ef8---95365599540.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fupofosajulezezalegafigi.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/20624871491.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/76357700815.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02db0c77de---zasilasuvataxi.pdfIn PDF document text
    • http://usmleworkout.com/files/file/32099422142.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc99856dc---71050564408.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zebikemuzopi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/56737186581.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/danixururafidi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8708becc3e57e753a8dfd883c13bfff9/70038139550.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cts29rkika6vigut39he362gh0/78893884204.pdfIn PDF document text
    • http://mutitar.com/user_img/files/26032027272.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/76381763062.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/86886570932.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/fafoferasafafow.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/58747694884.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7710475a74---wegutupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+increase+weight+diet+chartPDF link annotation
    • https://medlineplus.gov/diets.htmlIn 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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 16596 bytes
SHA-256: 195a745a10c0c621741074e63e0a05ca1c9d72a7acb4f6c637a2a67469bc2ac8
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10680 bytes
SHA-256: b8c25ff940a692a16cd13b2ba66628d2614e9fd03da83d78d5a75b9766b7d812