Malicious PDF — malware analysis report

Static analysis result for SHA-256 5622b61067056bff…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 18:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a08d28c9b83c3b63009b6dd15dbeb6dd SHA-1: 815a6eb0d794effdcf6f576429c6c1e5da548026 SHA-256: 5622b61067056bff23dca2aef73ab387d79fcc4534bd93c2d1c354b26af581cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and the nature of the hosting suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://iveducentar.com/uploads/assets/file/57726585023.pdf In PDF document text
    • http://tehnicgaz.eu/files/file/80848287178.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131a36eba2e1---23821128730.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wafisivovesogapapo.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/53592223242.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/relunevoku.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/70663470274.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161322848d4c0a---83909515171.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/wugabenisowenodawup.pdfIn PDF document text
    • https://tmtteks.com/files/gabazarafemaj.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/2978283011.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/fifafezogewopab.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/60922485799.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/vakine.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/5081338671.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tebelitomuwowepiz.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/papinorimefumurizazaz.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/32048017357.pdfIn PDF document text
    • https://eguiders.com/uploads/tukomarel.pdfIn PDF document text
    • http://zzquansu.cn/d/files/pemuxemirofelogete.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/tosiwan.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tear13dvmnvgtqcs2urvt2iod5/kigijalerafeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+online+slot+games+for+androidPDF 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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 17728 bytes
SHA-256: 8f388f0db187f09c6d2ea128d239b73a5f7bbd1d714c15695814a927819ab8d3
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 10676 bytes
SHA-256: c1c489e49a221e37215a247f920ad5ba2046873b5fce48f6b709e512857c9f18
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1