Malicious PDF — malware analysis report

Static analysis result for SHA-256 a398485da19b6e38…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 18:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e71e1d1764fff489eb3c232c9b6eb00 SHA-1: 00c46601d5b76232b633cc33e7d7a7ef8a3dfc3d SHA-256: a398485da19b6e384b0e5f5f1e5f6a13ef2f493ecfc048ca2ef099ae4318b3ee
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pune-india.info/userfiles/file/bunusipulefulisu.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60CEE77DB82C6.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/51145336061.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873d3d51711---jotidejoruwebig.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22a420df2f---20987798199.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d19579eb5e6---xoxopelapunagedovugaxeza.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2d6696463f80aae325470903448725ac/tinelowomij.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/87c9afedc1bcdef4686cb62b3c6766c7/1179014275.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/nilokofizitokowivinab.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/9806061184.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f37e5c81---satabafusa.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/8180338321.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/mameduguloz.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/47774755242.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/noxadefosowote.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160899f8d22643---41181477830.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7c13cd17aa701edae79cf5384431d984/86891668203.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/wipitesufolavotizel.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/82135497426.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wigowevunozofomusinon.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17df80bc64---87441629397.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/41353645086.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e68d6822a---difetel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+much+power+can+a+borg+warner+t5+handlePDF 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_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 17496 bytes
SHA-256: 69aaf38be717db4e7205a3f25a5f011a5134995ce6bcedce16d86ee5701e1142
font_01_sfnt_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 11152 bytes
SHA-256: 379793528d85e1d9d0b75670872fd381d3fcbdc2c62a8dfc25cd6757e269cb25
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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