Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81efc7130fb1e24…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 10:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ef99f60fc84da423333a6f03de7a85f SHA-1: d3fdfbab331fbd1756996eb6519eb0d6ea7b40a2 SHA-256: a81efc7130fb1e24c543cfc1313b8511a297af9f8d95f44eb086af0924758c41
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains minimal text and relies on an image to entice users to click embedded links. The numerous links point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 69 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.
  • 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://pensjonatagat.pl/userfiles/file/3474231089.pdf
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/93498485283.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f31ee866---fotolaxas.pdf
    • https://nurea.se/currency/userfiles/file/31640446805.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/kuxosex.pdf
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/kajus.pdf
    • https://perfecthospitals.com/FCKeditor/file/dasomunilegoxajekajoxudod.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a45339abba---powaviradivutupegoweba.pdf
    • https://butchercurnow.com/img/shop/contents/10154858091.pdf
    • https://gymlesgeants.com/upload/editor/file/koxomixodifijotulovidubu.pdf
    • http://www.stemcellhairclinic.com/files/files/55562035030.pdf
    • https://kawanmto.org/contents/files/venewinagoraxudamo.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/de7dbc090502ddf9131e6bbf9feb8327/xadikanoriline.pdf
    • http://chikatere.com/Upload/files/tadodew.pdf
    • http://nhahanghienminh68.com/upload/files/dilaxukaxidumokavilikemed.pdf
    • http://smenergy.kr/uploaded/file/9110205136146657b9abcc.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/25630159789.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/85934865266.pdf
    • http://letresorellebio.it/userfiles/files/28666377232.pdf
    • https://mangallagn.com/images/file/ligofijeti.pdf
    • http://annabarons.lv/files/files/ruvavageloren.pdf
    • https://aynadakikemalizm.com/resimler/files/fubexamager.pdf
    • http://tnmetalworks.com/images/files/goxujaf.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146fc155b376---97634064071.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/57477265199.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=marvels+spiderman+apk
    • 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_off0000b3b1.bin
6d8de4767af0c2356a01685e46f85f2c04ffeb5467f9c8c5d66515007301f21a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 10484 bytes
font_01_sfnt_off0000cb74.bin
b036e05b6433c84dc3a6be32ccaf9539dd265d016d04f62bd220ad32b33506c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 14788 bytes
font_02_sfnt_off0000f0a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 16792 bytes