Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1557f71601e744…

MALICIOUS

PDF

88.9 KB Created: 2021-07-28 04:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d164a8742c2fc70d01a3be4a0ebc18a8 SHA-1: e3624889745a005e9fb640b77ec30b5c62306ae2 SHA-256: ff1557f71601e744740d8869e97779b5fb5ca9631736a2532b5bd1ecda1bb5cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised WordPress installations. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d42f7099e71d0bd42b23b5b3788c2b41/pakifadirofu.pdf In PDF document text
    • http://farmaciafoglia.eu/userfiles/files/kagolotizopelop.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/46674015554.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/65e1208977d3728f9f0fbd1963e9d2c9/zoliguxitigazisutikusezi.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/ad15ckr1ekhul01jd6g9mkvrh7/xatikunabazigupexovofoji.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/45a6c953120b199b8a5025090dfff1fd/dabewerojutunatinize.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/pulurogo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4168ec4a16e058db91baf9fc4fa52d64/sobegawisosi.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ravuvijekegefijupara.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070139f33037---3317372634.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/nufowaveziwupotomed.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/12756943563.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/laxexor.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/tujikopojuvikumikatel.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c325067ffdf---kuloxofudakimibegajo.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/gagizugerog.pdfIn PDF document text
    • http://askort.pl/Upload/file/49416619569.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ea822c5c7adcdfe80fa7fefbb9717252/76628578674.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/75472013083.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/82191840855.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099133766f5d---39900129538.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/doziberapukimorajin.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c4516d6d---29850693794.pdfIn PDF document text
    • https://airshow-bg.com/file/63176039630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=parts+of+speech+worksheet+for+middle+schoolPDF 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_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 17268 bytes
SHA-256: b34c8207ea6caf7bc9c66a93a21597f16f625373ba8f31597da872f1eed7fa85
font_02_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 10960 bytes
SHA-256: 446c635a99b904fffd97386748790f15bca579cb340a8b6584c09a6c4d2ce306