Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11b153450707921…

MALICIOUS

PDF

94.4 KB Created: 2021-07-14 03:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6bb2503963b66a34ebe042aa8d31b4b4 SHA-1: 3a41ea1d4ffdbba2d3cfa268a1fb98a26ffe56bb SHA-256: c11b153450707921362c6e7e5847b025cd45caa89085ab12f4a179458927ba32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alexlunacoach.com/img/editor/file/wozul.pdf In PDF document text
    • https://dlt-nkp.com/fileupload//file/titazofenukilek.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gekisu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb31e2c36---babir.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f5b033381da1c8b8c40ec317200f858b/50801530962.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/91653013321.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/kazijafi.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/pirigimupitimi.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3671_20210601094639.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/matilupelelaruguwibuz.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/xiwavojabejuxilipasojupor.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/959844412af753c511bf5fe27ea7449e/lazenabixeruzefusam.pdfIn PDF document text
    • http://fairtradeportal.pl/userfiles/file/79918072607.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/f1ae7cb0b1b86f5a39dbbcd2e07e8b61/98329451294.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/46f959acdedb2532924655d8b85bacf0/76943438353.pdfIn PDF document text
    • http://nfc.soo.jp/file/jujekagabulexarux.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c68cf417e---mufikafadene.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d29cc8129---ziveritefafize.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/31119934999.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad802bdca---wuxibuminawazodibapapit.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7481a9a36d---68182866610.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbb84bb95---40350652549.pdfIn PDF document text
    • http://placc.info/up_image/80701336219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tupac+changes+free+mp3+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 18908 bytes
SHA-256: 64a7877aa91c12d6dceea92dcec3dc475038ff0fa11b41b2be29c80255ba74e2
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 11200 bytes
SHA-256: eade5680a53801e7069381424746e2ee27bad5cd2643b5d19e956e9f2aa36bce
font_03_sfnt_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 18140 bytes
SHA-256: ce997891a0356014c3b394122c9639e94506ef38168111808a36953268415147