Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ca2d80bcbe9aaa…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 00:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd6cca1912b3dbd16c535aa14180e5bd SHA-1: 2a9edc7145b1df656d3f00a664933181a1bc8816 SHA-256: b5ca2d80bcbe9aaaf9532bde46b2854c1de7b6f21d9a5075cc03d09bceb1dc3c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised websites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple external URIs and a link farm on disposable hosting strongly suggests a malicious intent to distribute or redirect to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://brette-animation.com/userfiles/file/23679703768.pdf
    • http://zxpgw.com/userfiles/file/bulitofigimu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611368425ff14---36003108628.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/84fce31d7707bf264cb5d658af10e76c/27700254080.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/i1lo53np1od5kiq0a1sq2pjd1k/zuwinavore.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad32aa215---7396589757.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/83fccf63025af935a667014ce5a524bf/1693311261.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b9ddc00a9---tejaret.pdf
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/62451192221.pdf
    • https://fratellifurloni.it/file/61920439407.pdf
    • http://codienlanhtrangia.com/Images_upload/files/68094748058.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/joxamafakezobavimuk.pdf
    • http://momsystem.ru/public/file/43156508653.pdf
    • http://havefuntogether.com/image/upload/File/nubukajipivebodigekalego.pdf
    • http://urduhadith.org/survey/userfiles/files/zezovozelarimubatojojak.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/99036317027.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed3fbe394---21963212690.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/5132480759.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/86nfhhag1buldriilmuola0vfu/70744255446.pdf
    • http://botosani.ro/img/uploads/file/subimenufunig.pdf
    • http://newworldss.com/uploads/file/15457486878.pdf
    • http://tehpromyar.ru/media/file/dasitapalenujugurafo.pdf
    • https://cecprint.com/images/file/migaxoxetinis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kalender+2018+libur+nasional+pdf
    • 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_off0000daf0.bin
3912ba3004cac17ed7960f839869bd034ed674803dc58933a99a16e5a5a88e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 11128 bytes
font_01_sfnt_off0000f4cd.bin
4288f38e4333901e8e8d149d8615dd4172a151569eef99c6d09cdec5b6274954
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 18816 bytes
font_02_sfnt_off0001249c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 16792 bytes