Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcdcdaad3f013c1…

MALICIOUS

PDF

92.6 KB Created: 2021-06-25 18:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6418574cf1b26aa121016c9b437ab391 SHA-1: 01a71189f9c1b2f9df7c8a2f2a41b95a331e6dcf SHA-256: 7bcdcdaad3f013c103a4d5e90327f74ab28960fae4e8d83388c290cbcf622bbc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://unnatiwelfareorganization.com/ckfinder/userfiles/files/sepinekukotanebidojini.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r8n7nr711rb7i2q5tskrov4mh5/guzawabu.pdf
    • http://pune-india.info/userfiles/file/nolosed.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f66607ba2---68392721275.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ee3f7c789---mekinefutixaketekefomafom.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fcd275565---zakokoza.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608145dfa3119---17604882934.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607941c86d28d---49375104149.pdf
    • http://maility.pl/_ADRESuserfiles/file/50812244098.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kobotidivijowuvuzuxe.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bccc6929161eaa6e0773e39f7ef890d7/pepem.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/477587b6a28b07e0021608ed7f9350b5/nekokanidekixesezaluf.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82495d4051---juwesunixezukuzirisoxuwu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086339bc2173---xuwuwis.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc05a45ecb---forirag.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3b4fe135a61b82b695543a44bcee977/rofilirulal.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afd1023130---bidube.pdf
    • http://microcement.ua/userfiles/file/22337739637.pdf
    • http://czdashan.cn/uploadfile/file/2021042820412573499.pdf
    • https://krassimirtaskov.com/userfiles/files/12901384191.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/82443mal5j79nhededm1j9olks/30724555458.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0c0235b6b874ea3682d7326d9749a4d8/xajiron.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4ea5956b07265e09159df8536f5665e7/kotumafonek.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953ec2a3aa2---12731690728.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ac+dc+rock+and+roll
    • 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_off0001064b.bin
2238799223bce5b87d5e9cb356a3fae52f2e08f1f8cec53685162026441879ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 18080 bytes
font_01_sfnt_off000135c4.bin
f9fda33a83261a6356bba0bf041a9d0612e94b689f69d2d5e040a735a124e09a
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 9944 bytes
font_02_sfnt_off00014bd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 16792 bytes