Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d2b9afeaafa5f2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 17:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8bb264479db93dfadc919ca18c5b4b9 SHA-1: f07d1cb1419c78e42c766bf868ef5983e2f119af SHA-256: c3d2b9afeaafa5f2a12b69f01cc0b775d6aee716418758c6ebb1e600b5019e0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further payloads. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dellalontra.it/userfiles/files/52298864169.pdf In PDF document text
    • http://promador.pl/userfiles/file/midija.pdfIn PDF document text
    • http://swift-tw.com/lcc/upload/files/89233992658.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tikokikot.pdfIn PDF document text
    • https://roc.mn/uploads/files/56101654082.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/a75mv4us87m4mbnlkpcsbcu7n8/kinedezuwijugokiwuwi.pdfIn PDF document text
    • https://adikketiga.com/contents//files/31262714119.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607125592397e---78240581142.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/fatax.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d481b98037---40943039102.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/66f43347f6af283c85b5aaa70bb29f2e/36266662830.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6d867d897---58045632888.pdfIn PDF document text
    • http://saydersan.com/firma/files/sifirakilif.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/meromor.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/o61o98h6tvu1thlf582n56lepf/41207223373.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/regelufiwiwutaluda.pdfIn PDF document text
    • http://abworder.com/uploads/files/53325450846.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/96969558363.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611145929e3f7---97942977645.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/22061327517.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • http://erex.hu/upload/file/mexifudapugodepenivutub.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gakomimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dbt+skills+training+manual+worksheetsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 18092 bytes
SHA-256: 599b531241d1692ffd40684e70f7ff9d52df6a910dfb21b8f9c89dd2e071bb14
font_01_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 10972 bytes
SHA-256: dd768e74dc331922bf3b00f72c485187d9c8a8dc5f761eac808c66c352aab50e

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