Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ee45a0689ac61…

MALICIOUS

PDF

88.1 KB Created: 2021-09-12 22:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77b12e96d0e3cbf43621fe444b9318a5 SHA-1: dd69f286e765e05093d42025065c9e3d3599e9e3 SHA-256: da2ee45a0689ac61805dc8852fdc679a0e182088f76da67ca7cc8704a294b788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=book+apa+citation+7th+edition
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hf5hkdv1hjasa69mgpfq7e82pt/jutuvagojonexero.pdf
    • http://jj-metals.com/userfiles/file/2021090202112073499.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kozupizigidimilotoluxo.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63b3748e0---nabajisut.pdf
    • http://naszymsladem.pl/upload/file/sotexonipujapukujunerefo.pdf
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/20397584877.pdf
    • http://bjbtrh.com/files/pic/file/jasazaxemeboxetizizizo.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/41386424706.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/51543992434.pdf
    • http://vladjurnalist.ru/archive/file/sotisamujoj.pdf
    • http://siltherm.com/ckfinder/userfiles/files/tekiv.pdf
    • http://pk.mo/userfiles/file/wumesokesirimeg.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/golofo.pdf
    • http://kite-surf.sk/files/99448950149.pdf
    • https://renesens21.com/ressources/upload/files/nelojofarokekojutene.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d208b420---88078379308.pdf
    • http://ranjitabiswas.com/userfiles/files/15615501952.pdf
    • https://rumusjitu.com/contents/files/79851366514.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/nemolinituxivibekixafexa.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/30319882062.pdf
    • https://radekslodkiewicz.pl/files/file/39290576612.pdf
    • http://liebherr-tr.com/userfiles/file/zujewixijigezoz.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/pirorogawubesona.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_off0000f20f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
font_01_sfnt_off00010a21.bin
b879a4e38a468766e0d5deae593fc1fefb54ca1aad125749c6a9b2d90cad462f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 18744 bytes
font_02_sfnt_off00013a9f.bin
eac500141dee8f7445b99c6a0562ad4c148b45e83966ee70e4ef185975cf3a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 10492 bytes