Malicious PDF — malware analysis report

Static analysis result for SHA-256 049dceb264c36c97…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 00:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d00b97c226006a40832e0e0d7a3e394 SHA-1: 4668546c3fe601f441c8cdc9b9c20680d67f8800 SHA-256: 049dceb264c36c9715f3c02893e691555ac6dc701d6dcb5d0ca7e32adede23f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://revucue.com/ckfinder/userfiles/files/61278173018.pdf In PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/34962477121.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/nawogunotufekanisa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161391286d250a---metorixisuvujikepumuk.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/wapegoxubunamidupaxa.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wenib.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/sojen.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161347e46a791e---23498811557.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/kamadadim.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/56589107277.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/galosirajad.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xurefotikuxiwojajetubaruw.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/jewivefowanivemimanuma.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/35286041830.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/53319541146.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/jubumizimezamokelurunelev.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/89373418815.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/81378121212.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16370f50---18031756539.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/16743101266.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d961e154---97726714781.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/59204196341.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/38055741393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mobile+legends+mod+download+2021PDF 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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 18304 bytes
SHA-256: bd165f7b834501e0c58d9c702ae1f20a40882b82caf27784ea07efe24a84be96
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 10908 bytes
SHA-256: 3289b656a57a1a45fc720b410ee959a8ad4c061343ad2336ae2ac3372eb74f66
font_02_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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