Malicious PDF — malware analysis report

Static analysis result for SHA-256 6481a19038c73daf…

MALICIOUS

PDF

67.8 KB Created: 2021-09-12 10:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e19bdb2c4c08d5ce81a5a4539c44ff3b SHA-1: f1874efa7fa77c0060f6f12fd8b51055d5365125 SHA-256: 6481a19038c73dafd12542c55e94ca195351ff1ae2f8cd23ccdb2eabedd388f5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and presents a link farm pointing to various domains, some of which appear to be compromised CMS uploads. The document body is heavily obfuscated, but the heuristics suggest it's an image-only lure designed to trick users into clicking a link, likely leading to a secondary payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fujavietnam.com/images/Download/58252021373.pdf In PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/85456304418.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/gorip.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613452b05ceb9---sosaxuf.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/42093901524.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/53128114364.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/xuwugesavowajovexitakel.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/87916111792.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/94180135613.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/74469450247.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/pumodaratawowumusorojij.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/bitozepubuxosevovi.pdfIn PDF document text
    • http://3asoft.vn/img/files/liniduliworewam.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kadidomovu.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/futefekuxavukogevaguvixil.pdfIn PDF document text
    • http://osayit.com/images/file/jonedowawakogik.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/94271274552.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/58730376759.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/15747326011.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/liremewosadedeb.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/sosokibeju.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/losasuniguvajomup.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ed99fa4c---buxadam.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fc61471a---lowikeniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+5+android+online+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 10332 bytes
SHA-256: 1136389d725aefb17d2a039226d2b1c3d1e9206ccbbfee134c9b5a3b3e9509e2
font_02_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 14348 bytes
SHA-256: b3bc754f870a304730d903a707b3f6dccc6de86212daee76279424bb80812f5a

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