Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffb382a5ba62ec1…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 18:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb78a2e068e49816afc3ef5b1b243634 SHA-1: 87b45e3b5a71b8a186df1995c7bbc53bd2696699 SHA-256: 9ffb382a5ba62ec1365ecbe4c9730ce50a39cbb883b688b5bbed855d4fa6f827
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thegioidahoacuong.com/uploads/image/files/43128046310.pdf In PDF document text
    • http://www.americaninvest.net/upls/files/vupufebuba.pdfIn PDF document text
    • https://led7.ru/file/xeteno.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ebc445405---xowilumelimo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0b79d9e48bf47e701345b1b84f151e8a/vunatonugokedelerujanerit.pdfIn PDF document text
    • http://cbstav.cz/file/boxolupopukuvosol.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/mexopo.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/delalinajosetenosexarajar.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/kaxurelukabebalo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146191eb9915---87236880713.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/13832659694.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/41857144244.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/18040660287.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/32ca133c0a798becd1bb65af6392b455/gusozulazibag.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gubiratomovovinawi.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/14183178074.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/sixaxalexunikilaze.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/fixeboxisusexoritute.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210901055507_x62gfs.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/xolepumitidawujewugabukax.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/vadafezalaludunupamu.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/gumamujajepeje.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/53959702179.pdfIn PDF document text
    • https://wittnebel.dk/file/86015872141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=candy+crush+modded+apkPDF 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_off0000af66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 14460 bytes
SHA-256: cc4d6a6ddf229f97d4ce6dc25778abf80157631ea8704ca4f24097f506dd8fd1
font_02_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10880 bytes
SHA-256: 0286463abf6bbc7ab9e9967cba5896c27a964e822a747209cd645e8fe76a98fe