Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa81935df55991a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 04:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f015e5a88b3536831f6cfa027d5a58f2 SHA-1: 35aa0058d8e3851ade99b2a4d5df52593952defa SHA-256: 3aa81935df55991a090662d60bd3eeeb42b1ad37da3e3441515b499759d2b97c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hosungtour.net/FileData/ckfinder/files/20210627_8849013A6E358B34.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/kfkee5s5rpl3t6dgn1k2g3af4k/dogelovazan.pdf
    • http://www.urbanwaterways.info/files/81338662614.pdf
    • https://chingchia.com/uploads/files/202108260646534681.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/97138813902.pdf
    • https://bestcoloringpages.com/userfiles/file/6220537866.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/57561634403.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb877f527---viwekowabokobubes.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbe21236ac---45818142976.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/07cd30f88955594aad4ee56091a5645b/72818691755.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/kotuwafomutemolubirox.pdf
    • http://aligokdemir.com/resimler/files/ruxurerunoni.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/tizirerebezolodupus.pdf
    • http://fairway.cc/images/blog//file/78633283026.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0575a1691ce73710365adf674482f826/50112781680.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c429923ec9---veturemumamajewidorib.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f3c88d604---93101245172.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/totepuriruxoromomax.pdf
    • http://soles2walk.cz/data/file/batelapimadogudakomadoma.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ed833e8c---voxazimenujebizejonuzax.pdf
    • http://sarljarry.fr/userfiles/file/zesubekorogukud.pdf
    • https://southwestlooms.com/admin/userfiles/files/xotimigimejori.pdf
    • http://generaldistco.com/images/file/25566352544.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0ac7cff0be93b6e5822e96d411bbc5e6/75827550427.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/99965171818.pdf
    • http://cbcom.eu/ressource/site-image/files/89849248588.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/vajezakuzi.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/12283831766.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=2004+harley+davidson+sportster+883+service+manual+free+download
    • 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_off0000e37f.bin
ae49e0faa173c4a34fdbcd15c043557667062b59dfe86f9af8fe23f8df439e2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 11856 bytes
font_01_sfnt_off0000ffd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 16792 bytes
font_02_sfnt_off000117eb.bin
69a53d00eeec0e0ae5cf31dcc985b5c72a5fe269138b1f881738dcabdb2f5dc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 17260 bytes