Malicious PDF — malware analysis report

Static analysis result for SHA-256 70926fac5cf2cfd1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 18:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26ddf4a710a450d2086d82a6c086af38 SHA-1: d0d79e2983b25fb59878e12824f16de502b4aed3 SHA-256: 70926fac5cf2cfd1001b0ad3c5d606eeabfe6c69e50e2aa420d2f644677dfdf5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://beta.nhatthiengroup.com/files/uploaded/files/golirinixo.pdf In PDF document text
    • http://cdkkck.com/uploadfile/file/20210911213223.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/37684132488.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dit5vmsipsbf8i9c24n3uiqe1e/simakofoxedinuferijawijo.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/tamiwalajupuxe.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/jisapinu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/renesefufejupakas.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/10691267744.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3ef27a93e029befbca92b0b3d16cc91f/xukuranelolovuforonalu.pdfIn PDF document text
    • http://a-pluset.com/userfiles/32914249853.pdfIn PDF document text
    • http://kalikraft.com/images/file/kupafugelodusokiwe.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/jijuxejudekokolem.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/xenosobe.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/nojogejigovununu.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/tolif.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/sasizadavaberoli.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f68b02ecd57834ef725d0dfa83be2ca8/34072616561.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/23417485291.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/toporadosir.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ccb429a3---58626899700.pdfIn PDF document text
    • http://rld-carbon.ru/file/jurufexegosibed.pdfIn PDF document text
    • http://careersourcechipola.com/files/public/65412501408.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/58019706092.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/lojif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gcam+apk+s7+edgePDF 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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 19088 bytes
SHA-256: b1c3866f8cc05a4d1a8532ffda5e78ded6d354debdef0685665e6597368206c5
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 10476 bytes
SHA-256: 33ed8eecdd9b91188ff678c9cad461fac1d0ab69008b8e44cb1020ce6aef9794