Malicious PDF — malware analysis report

Static analysis result for SHA-256 672efdb2b2dadfe3…

MALICIOUS

PDF

106.3 KB Created: 2021-07-05 03:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ea66e1209aac93a6eb736531884766a SHA-1: c4f75efce4805b08fd32b51e9e8aada8d194f46e SHA-256: 672efdb2b2dadfe398ba127e0ec24aebe7a7610668b8c5aa269159dba42d088e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly supports a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.buildingmalawi.com/images/uploaded/documents/77424995994.pdf In PDF document text
    • http://hayatteknoloji.com/webimage/file/lazevutovewifumobetabopuj.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5832219e4b---32134848904.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/uelttqph8l9sj2lfjduni3hnm7/90252214247.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rajanapuno.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074260d4ea0a---51092215006.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/328059b20aeb2a5664910a5ba7af38ab/totigasuzan.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6bs1kfafu0rbvelv1s4p50qtep/22119545459.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fogawupofi.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/81730467410.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c32cf3c5---2392207172.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/nipivuvosamudawarorofuf.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc602d8b0c6---suzizifozajolilamusegefem.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/tuxorewagulubakunesu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/727dd94b54205ed44a77df0448940d54/zawipajulerotubi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f353e8999ce1de4cd13b4b64f2cce80f/lanevipaluba.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/63258532874.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/65075243623.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/aj0fu3qn4kvpbpbahfklhnt357/89110414107.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f6888d5---71076647808.pdfIn PDF document text
    • http://poorclarescork.ie/images/nexogasomuvugovinumikevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=excessive+cerebrospinal+fluid+in+the+brainPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c8dada91---7794041610.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_off00013a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0F 11108 bytes
SHA-256: 1ebe73bb1774b17c0653484f6e7816dcd23753eaa81901cc8237a5c55bbdd7e0
font_01_sfnt_off000153b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC8 18560 bytes
SHA-256: 3acab5107808aaccfa92140954419dfae72e69287e9e5aa61e3d1c961d42d7ce

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