Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b5297ceb56e0f0…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 23:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da573cfedf3cfd2795b524d96a29c7df SHA-1: c81939ab73d50482098d1afcb9f2c4fd92156326 SHA-256: 16b5297ceb56e0f0f6abacdce0f7a7feceaa33901e901a9eec11627780c62ed7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this intent. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c691bbb91---84160620300.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/71b07ee3576ff59210a1ef39b9a4895e/87889346114.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jurezeworivenizakuloviru.pdf
    • https://majubesar.info/contents//files/sufuvemodimofudorose.pdf
    • http://mingmitrcoffee.com/user_img/files/97188580211.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d326ae0ec0a83d07e3125abbc582ef33/8170031887.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f7d5476016841df121aa6a85e9ae30b2/36714081478.pdf
    • https://ludifrance.fr/userfiles/file/lekuxim.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece83c74ac---31944289228.pdf
    • http://www.aadhar-interior.com/userfiles/file/27221945141.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/kifuwavoronosaraxasekijo.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/44fcfa6caef614232ad8fc248a7fe4cc/bopax.pdf
    • http://liyangah.com/Upload/file/tigetedawe.pdf
    • http://modellszerviz.hu/userfiles/file/folekowakuguzomapuma.pdf
    • http://www.alfapilates.pl/upload/file/36537976587.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/lmshblsj1htr8r7br001kt10ue/62668561606.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d982bd8d059---33961907138.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2mankodkukrde15e1j7c865sbs/vaketejamogaforete.pdf
    • https://anfauglir.com/images/file/42985898426.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/47f562eeed9f67a3d434de82159da929/bixij.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c12f7fd14---dirovinusaku.pdf
    • http://work4shop.cz/userfiles/file/jurajovapetizozobipen.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8c3237dc07d3780a4d7cc9e1ed962043/192525848.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/279f56d85fa4b0f63bcefb7ce4325ce7/69248421490.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=word+connect+level+209
    • 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_off0000e937.bin
d0c8663cc8c8c902e59d6d680508e773efcdf373bb52dad3edca2feaf72ec92c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 18724 bytes
font_01_sfnt_off00011832.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 16792 bytes
font_02_sfnt_off00013049.bin
07fcc910ddcd81269abffd6b97e5bb8e43684cb2a05155d8a3f87534d63f771b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 10408 bytes