Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca5be1bf8b373d3…

MALICIOUS

PDF

99.6 KB Created: 2021-06-29 19:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 437889385f356ac1501d1853a8ab4379 SHA-1: d41f38b3bb80d69c91360782eb88a894491fbb03 SHA-256: bca5be1bf8b373d3b2c3fa9afe1d784acf04c3750da6dfa62125590efc940d18
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a0186894---78932374310.pdf In PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/46qie899eerb82ko7tu7irjin2/75357152126.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7c006dee5646bc2b4fded7f89ca84bd4/zesamigoxo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/40475895525.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/gr14qmfrtp3fpivsrljr1btq12/dejigasimav.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/76459689621.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cb61d035d4c14a657af8b528b27162cb/99539627239.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dutatogukapawi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bffbba73718---90342399573.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf775374393---rurarikabutilorepegura.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5470c4b4362a8b1bf23e48e0ddc16e4e/zelidovomavefavo.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/jezupasusewaja.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95052d5828---kanebubef.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/felukonafominoxulovudibe.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qfm35uu7ug70545fopk7tfeacb/95955166172.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3c9396e3dfbe74df9f543724d293eb97/24780905049.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/begosazened.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/25149751839.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vj6bvqicusbq3abbpulg1ucsv7/48064102192.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/56379618274.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee42908a9---xarajipikof.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/71431095385.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b9a9d680---24399842512.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/dd3d7dbbb78803d8398926020440231c/68967738937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+meaning+of+haunchesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001474c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1474C 18784 bytes
SHA-256: c24544ba7f7a6c818194bd371b6efbf7855719d4db7022d3543ed738ac596f8f
font_00_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 4356 bytes
SHA-256: 2a7d655d84ac5010067957ef29e8041411239c83d1b4ebe3ee9669276022071c
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 25316 bytes
SHA-256: c55cab7fe3a9d6e9ec5e9c7722a515648c1404fde528cc3d20fd15cc5c68f43a
font_02_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16675 10600 bytes
SHA-256: 6bda6ff6f134b8d4483129f9a5c05764e000f635d6555820f9f070f1bcb235f0

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