Malicious PDF — malware analysis report

Static analysis result for SHA-256 409e57eff07a5ca9…

MALICIOUS

PDF

84.9 KB Created: 2021-08-24 01:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 581b03976c8dcbfb7363c2618dfb7d11 SHA-1: a1d50592c2e476839b612f166e0e2ca78f916c49 SHA-256: 409e57eff07a5ca9b5ebb6cc7cd37d63b1cb321d110bf818d3482b5b92e982da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lindendirect.com/tempimg/file/xegilatoruzimufekawet.pdf In PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/9397072433.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/59154893686.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/17943210608.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/83894782728.pdfIn PDF document text
    • http://simonide.org/userfiles/file/tenepibutim.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/69bf5c126fd78b393149dcae525e8abf/lodanefukazukifugozije.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/genizebimujiba.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/33711946823.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3bhk0h8k703oamikvhusqjplp4/59218656085.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/zesaxu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d51fc828c---21795664401.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe22cacaba---89238928608.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/snpghak4pdbcjapc274n29f1nc/nugavazutunari.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/pesoxe.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/51551644027.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/95278437579.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106131230277377.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c061ed94fb7---fudubiza.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/salusus.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/fazalafodut.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/81ef488b622fe0b8a5021176926257fc/gufulovofozupewerigi.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/46357063504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fun+songs+to+play+on+flutePDF 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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 10532 bytes
SHA-256: c2ff6f1c75b899c0b6442c145374a83bdd864e3f5c95a495b3dbf331c47dda4f
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 17480 bytes
SHA-256: 47cbc7d22e8897e881bee5b93622f69a072e564647a6719eea683c1fbdb92416
font_02_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1