Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1214197f4b8b9c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 08:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8879f84ba8dd9cd008d70b5da744c49a SHA-1: 5b4e8f47aa1d164beeac7146fae2ced5d74cd4d9 SHA-256: ca1214197f4b8b9c2da2f6bba8c31b45ab1e3520edd0c25775861a3d1e2fae10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=pokemon+go+joystick+apk+ios PDF link annotation
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/faxoselekexawudeporotagiz.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/potipuwomavisi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3d2a3032841e9a719143de74c59e8407/veworazevuvepejip.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/lifejelalemizut.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pogako.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/ninijarenidoxubidufasa.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/gulagemizefokurunuvo.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/vezovokin.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d8305ca4---zubib.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/welenubabevematetibokexi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317ab1ef678---65077746666.pdfIn PDF document text
    • http://rjt1.org/upload/files/22682234918.pdfIn PDF document text
    • http://meta-min.com/files/wulovifurugoboka.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903210806.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/32236617467.pdfIn PDF document text
    • http://remobudostol.pl/pliki/fenepeza.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/93517523489.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/bozepelumojugepapowi.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/19520877682.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/16255715701.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/venugejovotawidatigegud.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/ridegasunas.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zelize.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/majuweb.pdfIn PDF document text
    • 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_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 10908 bytes
SHA-256: 701d26b87b8effe2a371fd9c0de9d24e91e040cb723ca22cafab169193df0ea0
font_01_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 18532 bytes
SHA-256: 94c2172b7fcd1f1b9d6272f1ab3256098da02cc7c62320677e52578e37c3cb93

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