Malicious PDF — malware analysis report

Static analysis result for SHA-256 e679906160fb770e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 19:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4fd4f276f09944385a01715e7f8a3850 SHA-1: df2d9492a6c726c86927c3593e5f8d97f769a2fc SHA-256: e679906160fb770e47dbdca9b1d9fa71ee2943cde8f29cdcf32ecd0b8cb68753
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=sony+six+apk+download PDF link annotation
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/gexududaka.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/wusopavaf.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/19432245277.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7bcdb21a---ketegoluso.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/5199397156.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/4to06r2hfm2gdke8on01dj5sp3/newosutigosavamifobeba.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/52019155688.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/kitin.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161447d575f4ef---82530134363.pdfIn PDF document text
    • http://strap.sk/uploads/file/pesegokukibizafiw.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/kokagisuxapegokuru.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/97701368608.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/pazizulete.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sdvcmt3agb6lo2n721gqr0ke73/46091126818.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/33429708305.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/86452765166.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/19495849096.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/vowoxokatexananudabasod.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/29982264291.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jawene.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/11194653935.pdfIn PDF document text
    • http://dsagco.com/Upload/file/rimemebagidoxala.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/wajofawixukepezijifogewip.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 10524 bytes
SHA-256: a4d7e57147acc7353067379cf39f1e39e5cb64c3a5776e3b5e034511db074506
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 18796 bytes
SHA-256: 88954c6976fc997abbd2602d27ad7f77cc815513be888444460b83ff3037ed0d
font_02_sfnt_off00013101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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