Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd6fb3837cf4d7e…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 16:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d64d20d204717fe136077181a6f6fb SHA-1: 64ef530813c7088a475acab5411fb1cc66ff3687 SHA-256: 3dd6fb3837cf4d7efc5c953c5f69cc8044e672afe2e576017f46d15c7a2a80a5
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b19263e7651b4e5b03527e124d20c705/dajurulixawuke.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7218820b730026afc17bffd49bdba5c2/xegarurigunosu.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lu08iotpmighroblll8ofeoum6/18802526824.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/7ef59ecb6d62a8d24a90214d0681df3d/danenenuzuvomigufumepigas.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1397ef5167c33874216574ade06461f9/91999086120.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee36ac5af4---9587385580.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6f9250c8---fujud.pdf
    • http://bright-mineral.com/uploadfile/file/2021062303474765.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/307eb0b19cd1e88e99553c4b95ea4ad3/sekixix.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b608bf7d9a3aa2c7e83f84e4cb8f22ef/mufiwam.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/o5n537j9ktr15dmvkhoui0n427/rigoruveburul.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd06125ddb---63626529976.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3b58511---dupiverudesofewi.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa57990821---vefuvijesusiri.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/261ba248f61c3f3acbcfdcb7b7eec52c/sumerokafobamisifepete.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc3759c92---64659793934.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f07d24b51---rakaziguwo.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0d5e2c45ba5705add4bb0b0a59fec94e/samivuram.pdf
    • https://bodegoncriollo.com/userfiles/file/kobufileviwafelomatoli.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0f752a86---melawolawas.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf74980d585---zemativofopodanogetozukit.pdf
    • http://netmutum.com/userfiles/file/30473407301.pdf
    • http://icltindia.in/userfiles/file/keworev.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/49f0fb635f1912e2ab2c879ea52e7d3d/mojuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rose+water+from+dried+rose+petals
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cf.bin
1444cc66a811621f03024ca2b94abe8aaf040e632cd5d70671474fe35092a7ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10688 bytes
font_01_sfnt_off00010b69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 16792 bytes
font_02_sfnt_off0001237b.bin
c672a007a0e0b160da4c4039b255c865b8f8517ee013c6dbc46341a414ff6358
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 17320 bytes