Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b03ac7ad31e960…

MALICIOUS

PDF

92.6 KB Created: 2021-06-09 05:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ff341e12e6beb029b36a10daf06fd0b2 SHA-1: 22718db5c738210bb667f53537e2f5e55055df43 SHA-256: 88b03ac7ad31e960f448c8c72cabcfc399221fc87d2ce63007fae6337debf1b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=hada+voda+samagra+pdf+free+download PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kvrnbp60lvssabkdvk6csh1476/mejojekipikaxejesogi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099083189f17---boboroxi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb847d7df---30166737350.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0ab1bc70---bijapufej.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/18778273515.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ltr82u8elumnsd1tb5osqql3c1/70428021485.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad56d31ce---mokukuguzokifeb.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099eefe3f92c---wuxexefibulifujeli.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608869fd699e1---wanenafafesiduxikatagiw.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/27629e06a26346f1dc32e6b42b8f09ac/luvamujuzogizuja.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/78911888727.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ad34f49a29af8c62ea63b48798ac72dd/wuwaz.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7af069d542e916c8c95fd623e6d014b3/zefopomovasopojosif.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4dd1609398a4f384cc92ea568f7a0e26/122998948.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ec9de3e373e87f1e5521162d086548cf/toxapakudijikepamawufoj.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e1394430e802b25b7e2277a97129c366/vefekiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013c1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C1C 17056 bytes
SHA-256: b1b86863bf1b66458fe454139209c675cbc8b7a7c8040865d939f6ad117ad4cf
font_00_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5472 bytes
SHA-256: d07f6ffdc8aefd499364a4c7af78989acf21fb95de725b69b0c418c5009cf827
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 3188 bytes
SHA-256: 9ed0df8556b638cf25628a28e85e14a810d9a05fe3f33787fe84956d4d5439a9
font_02_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 6584 bytes
SHA-256: 901a3f19ee51ae724248b0c8b9a608481ef75ba4911a841dcdee954d6b2741de
font_03_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 10396 bytes
SHA-256: 0af1e2c238902b8032c26c7d6a08cf106dded20ba3c23767be1659faa8897b59
font_05_sfnt_off0001547f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547F 3544 bytes
SHA-256: a5ac2a075113cff9ba7380fcafca012ac6f8c28a0128ac9e2a08ba135fc83799

Open this report in the interactive analyzer, or submit your own file for analysis.