Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8c7624d6556c36…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 05:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5cd8c3a77688f26b2e64cae552d941b SHA-1: f05f73bdd576a036233d0b976b7f2a14d8a3575c SHA-256: 1a8c7624d6556c36ab6a76cadd05fabd2a314ae58ee589910f482247c54ac85d
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, many of which are hosted on compromised or disposable domains. The presence of a 'download button' lure further supports the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=voice+changer+apk+for+free+fire PDF link annotation
    • http://teusz.pl/UserFiles/file/97484804877.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/15247237834.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485169a3be1---54228178273.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/50362554460.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/2888427409.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/fisokodenotedowutuno.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/retuzedimawuxomawasid.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/delawetiluxewuzekawaj.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/jolovetes.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feca9cd0f7---zamozibilo.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/refilefazixigawajapiga.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/gufutulefepifesita.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/27052713202.pdfIn PDF document text
    • http://contelex.it/userfiles/files/59883770119.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/88974125615.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sezirusakabodokatemavo.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/nitaporulowetex.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/tokudupobo.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/faserogubuw.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c4047738---refonefelonixob.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0b38ba84---71810791807.pdfIn PDF document text
    • https://totounited.com/contents/files/wivafelapa.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/80729432898.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/65171585244.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_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 18312 bytes
SHA-256: ebbe75abcbbbf55573c5aad3ab636599d4822cb901ceaf9ef731e572c575152f
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 10508 bytes
SHA-256: 5588d1466f0ce1c069418d54d1951e148509cf8f59a421962ef902045fec7227

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