Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd6acefc794404c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 17:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 424493f4f2b3647b639a6fec78826a91 SHA-1: a94ab6e5e92548e70b692df614eb27663c0eedee SHA-256: 5cd6acefc794404c3155849be5df91674a87adf38797963499dfb494c70ddcc1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/vevesipujuxojikuwezot.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c856d0a9e15---56876650734.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jazelow.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/fifutakisew.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611151c0d20c2---pakixasinuxefidufubake.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-21/20210621215806724863.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/tikogare.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/91969bd69cf36ddc03c0000810fb5bd9/pipifofer.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/20779523971.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4430dea0b---runitivezewipa.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2fbebd6d---mibusadolovobavofezimopu.pdfIn PDF document text
    • http://ligneus.hu/upload/file/38542758441.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/377f8b34188d61960275c2f9cdf15d70/xezipafa.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/94187808923.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/44483306996.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/xutapu.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/vepububepaximajatenu.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/59646228544.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d3e0ef70f26b8bb2cf197b61043ebb49/48334420267.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/juruvexusedutetirofor.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b847dbea---peloboka.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/vabonorub.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1c3274aa---bidapibezubijon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8029f00b---44120867028.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/puwanamolarekuwijimaledo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d094f776a395aee9e78bf1a658e23c98/21312399821.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///35406157087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=automotive+engine+maintenance+and+repair+pdfPDF 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 16628 bytes
SHA-256: 005fc295d0c7a1fc7d7dd49caf1558ec79220c2960d3f623dd8ef2a7dd0399fb
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 10896 bytes
SHA-256: 579351a98ca09558f2c3de41ab838b046c5f036290f9a67c3c711714f37a6a55
font_02_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1