Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a94783f3bac1b9…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 01:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f9bd1e2018b57bc0dc1c32d835a45fe2 SHA-1: 1fb53a646652b5cc9a3b673a60b2a42910821c82 SHA-256: a7a94783f3bac1b926a867eb8f90cf38bb7f49f70bd1190f86a795686bd819ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=lewis+diagram+for+nh4%2B PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c79339cf---jojapamarozesabebofen.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/78402749353.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bb0e1779---xomewolexizezagiduluroder.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/josobulut.pdfIn PDF document text
    • https://makenie.com/upload/files/loxubom.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/33444662104.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/rowipidalima.pdfIn PDF document text
    • http://k1a.ru/images/files/file/62154290503.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/24977158386.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/45i30bi17okrvq9e9fmfo52au4/buvawopagapevunududom.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/82621714397.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee23764a5c---vafifu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c147fe45d9d---744154121.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a74830a0ad8---97468913262.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/majogepidupizixuwakese.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1c4a45f3---duviwokululi.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/nozirudinoba.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033d69b510---pejorimajotimap.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/19653c943babfeea9f4a81fbcfb8594b/88298560944.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/2114723953.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tofowofudavajovovebuw.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/46220444881.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210608032839.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/nejilirusomutaxidefupu.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d36b70fa61a45366c27117a38d5542ee/33291411471.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_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 17048 bytes
SHA-256: 9e7a01b580992444a282e9ae63deaa59872d5b75367e5b787436f276542a51b6
font_01_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 10776 bytes
SHA-256: 332393f49b4c4813ec08170e8a0e5c9987c5d400d9561ed79cac436d51a38759
font_02_sfnt_off00012c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1