Malicious PDF — malware analysis report

Static analysis result for SHA-256 038059c85484739f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 11:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eaa63c50fe94c1f7b0e19a049cd1b90f SHA-1: 5f0b9503662810f909e9c647cc4356abb99c8166 SHA-256: 038059c85484739f65debbfb9533711fabcd9f40cda10ecd944e1babd17f462b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hurtowniagrafit.pl/userfiles/file/famatopazir.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161370ea923685---29555142993.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356adc9cd4b---wajibuviwavasibapeguleda.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/jelojufozubizerawanefuvo.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/29519964937.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gexusezusurana.pdfIn PDF document text
    • http://cssh.es/img/file/viguzazabonegabodu.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/42947559635.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pamibawelogefazalij.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/pomibabixalizim.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/68936910171.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/saronuzegebusuf.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/43581030620.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/wutasewularir.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/nemefazopozava.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/94158786270.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/muguluje.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/27754024609.pdfIn PDF document text
    • http://cartopack.com/Images/file/31864621776.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/gidokewitopozaje.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/79613774895.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161300cb934c44---xewitorefo.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/3075197309.pdfIn PDF document text
    • http://sbairs.com/datas/files/67623030300.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/11891298642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=happy+wheels+level+editor+androidPDF 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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 17532 bytes
SHA-256: 3a3e7265eac08b995273d4cce38e5ff7ec5715e1b6ca33ac65308d97db764b42
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 10748 bytes
SHA-256: a47a44f218eb0d349fd8be07337555d21c3382c4a7916fc4bba4e742179d971d
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1