Malicious PDF — malware analysis report

Static analysis result for SHA-256 807263fa35fc29e7…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 02:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22a06946440913a0cf146c472aef4978 SHA-1: 599a4c1e62e373a7eaa4d3a86b29f296ed42a066 SHA-256: 807263fa35fc29e709f133b5744a5bd2c627c19061f1064c130adde02bcf73a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xn--b1agpbmdtf.xn--p1ai/upload/file/masowebitesijobuk.pdf In PDF document text
    • https://matharu.ae/userfiles/file/gitenekipozobegidutu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fuwanebujesakenok.pdfIn PDF document text
    • http://nprofit.hk/userfiles/82580750200.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/jozewutividufetovujas.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/lijulaxunosanoxagowon.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160931d1f395be---731243126.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/xepejonegexubunakoje.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/mamedaxej.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/5051559448.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/sapugijapuxabaridime.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7d2ef2e2d4729e8e91c6342ceb8955f9/59826042106.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/38855877474.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/nizurulakemofomibezezavo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071427a92256---danefopopi.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/69742653300.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4ff3b0ffa535bbf4a772357aabd984c2/89172253025.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f328001ce3---4480435505.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///tozuj.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5b601f5d1---83763211629.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/32997311763.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/q68rdgtb957sikf6hcnbp95vkr/topunakaruxufixaw.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/boderamizawot.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/patukexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=i+only+stay+with+you+one+more+night+lyricsPDF 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_off0000bea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10928 bytes
SHA-256: 65620cafc627fa15a3a867c78c01324226c8855725364a91b6ea66381d632b94
font_02_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 15128 bytes
SHA-256: c7840f19c30bca182b86d01f5cd3399f6e456155c55d72d90b3c4c62abb56d40