Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8a10eb0ffb97e7…

MALICIOUS

PDF

126.4 KB Created: 2021-08-02 22:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3fe45f06071dba4f01e4de0a5a115315 SHA-1: dfb0e437cf39e6fa58065d7b19d1d702cfb49ab6 SHA-256: ba8a10eb0ffb97e7072551bcbc04e8f93ec0702d2755df3ad9593ce451cbedaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users through a series of links, potentially for SEO manipulation or to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9212

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://j-line.ca/fck_upload/file/43402373057.pdf In PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210721/file/16268392002397.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/lagasebasadisesosuxaga.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/nawuxogek.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/84f97c6ce33f62e42e6a96a46a61624d/13392199110.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/muturepewavokelowisabasu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5d1037c05---52766338647.pdfIn PDF document text
    • http://synowka.pl/galeria/file/sunurerenexar.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8nhvt8d16rpk83a8qcopb02k1u/womoberigapowowakep.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c733116d3eb---11903186289.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/vetitimu.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/wumalavaj.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/fanarebofepajapaw.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/786f059e976f104d13d54d32450d0605/17461290387.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/girevizanopigopegumego.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/41371982791.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fupgmti9u9171a8bn7re00vc73/78800038408.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/rofodozixarin.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qack5pck358s3vig5adgf7inc3/39419429763.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c419e731---dupud.pdfIn PDF document text
    • http://ippon.lv/uploads/File/fubonenemode.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/42836503287.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/51129686220.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/rowofapuxadidobeke.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wowipobuloximeti.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078528a8cfa6---4966821153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lehninger+principles+of+biochemistry+5th+edition+solutions+manual+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B66 11512 bytes
SHA-256: fc2bddce5259d5282d24cda343728c9b6cfc7ed32f6391146cfa505994c155c1
font_01_sfnt_off00018615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18615 19100 bytes
SHA-256: 7c90854f9fcb7cf26aaa7d4d14ff7f7c6cf846b001b6bdeea49a01f93a011b81
font_02_sfnt_off0001b6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEED 16796 bytes
SHA-256: 040282cb5e6a787f5694f305934b234e7dd8a75d1a965bb8453225fab28577fe

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