Malicious PDF — malware analysis report

Static analysis result for SHA-256 befab9c9c224e01f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-29 10:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40c4a1bd52c9f16140068b4a1c0630bf SHA-1: 32e5215bfed96d83bcd2e7f036bc7c248ab77204 SHA-256: befab9c9c224e01fed8c0410be6b4397b2224d7f94a35edc147964ad88747ccd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cana.vn/uploads/userfiles/file/53846295214.pdf
    • http://state-lithium.com/upload/files/91033343004.pdf
    • https://doxity.ro/ckfinder/userfiles/files/15007233551.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7217de57a---35920445138.pdf
    • http://wwm-quanta.com/upload/files/60868847204.pdf
    • https://beautifulhairstore.com/upload/files/xepenekukifafivuvixasut.pdf
    • https://cpsguffanti.it/uploads/file/jabupuvufe.pdf
    • http://riverhouse.at/pcms/content/file/67830075818.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/70743606999.pdf
    • http://ccsup.co.th/uploads/ckfinder/files/tumapi.pdf
    • http://sjzhtchem.com/upload/files/79139025272.pdf
    • https://acrgroup.nl/userfiles/file/vogemafisuwudekavagogo.pdf
    • https://msiutilities.net/documents/bumatixunesupam.pdf
    • https://bunyaminerdemir.com/resimler/files/76259808302.pdf
    • https://softwebstar.com/shop/userfiles/file/zonumowuto.pdf
    • http://debeleven.net/UserFiles/File/81884532598.pdf
    • http://k12kos.com/ckfinder/userfiles/files/71020337132.pdf
    • https://stauber.lt/images/files/muzomexi.pdf
    • https://gastriklandsbf.se/UserFiles/files/24295353372.pdf
    • https://cyberbirddog.com/userfiles/files/65437110160.pdf
    • http://qdjshg.com/files/file/lejavikis.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dbdd8def699b0e6e4abbd3842d38acc3/zevatofubewejug.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/759fe58b89c817d77cb6d541ae6165e8/18335604656.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/lefajabil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mengembalikan+file+terhapus+pada+android
    • 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_off0000efd4.bin
116c70ae935cd2853cfebf9f857215b2ea857515879d7968b4c13873eacb439e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 11268 bytes
font_01_sfnt_off000109a0.bin
ee2b0573657ee858a5e2a74faa98fc70fd2c73591fd1a18978db2056404ca923
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16384 bytes
font_02_sfnt_off00013467.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 16792 bytes